The next DRAGON AGE™: Behind the scenes at BioWare

This. I've got pretty slow reflexes at times, and I ain't gettin' any younger.
I also cannot see how manual parry/dodge could work with party members. AI doesn' seem to be that good in terms of using talent/ability based evasion features.

The fact that almost all mainstream game developers (with certain exceptions) are largely abandoning single player gaming in favour of 'live service multiplayer'; the last Fallout title was multiplayer only, the last Bioware title was Multiplayer only - and how Bethesda and EA executives have gone to great lengths to explain how the future of gaming is multiplayer.

Oh ya, that was on my wishlist for DA4. Companions not standing in the AOE of fire that continuously burned around their feet as they ignored it. 

THe tactics in Inquisition were NONEXISTANT!

I would think that a single-player-only KOTOR 3 would be a fairly safe bet as well. What it came down to was Bioware wasn't brave enough to make a single-player-only Star Wars game and Respawn was.

Well, DEX-based defense ratings in DAO gave them some surviveability without having to do much (unless confronted with magic or auto-hit attacks). Defense ratings in DA2 aren't that good anymore (the penalties against elites bosses...), but In both we got a few talents that can be scripted via tactics. Like Varric surrounded by at least 3 -> use Evasion jump to drop threat/get back/chance to stun. DAI lacks these customisations, though I have never figured out good tactics setups for stealth usage in any of the games. Mostly use that for occasional luring or getting rid of traps (in DAO).

That's a weird list. Did Red Dead 2, Persona, Outer Worlds and Devil May Cry release this year? And thankfully Sony are around. Their great singleplayer games are one of the few reasons I want to continue playing video games. 

I don't think great single player games are going to completely die, but they are getting fewer and far between. One of my favourite studios Rocksteady is a case in point - their last game was Arkham City in 2011, and they've spent most of the decade developing and scrapping games only to finally come out with the GaaS abomination Gotham Knights. The same with their sister studio Montreal and Suicide Squad. 

Even Ubisoft, and Capcom, are only making singleplayer games for only their most trusted of franchises. Heck so many of Capcom's biggest projects have been straight up remakes of beloved classics, and almost guaranteed sellers. 

As it is always been: Single player with a multiplayer component. The majority of successful games such as COD and Halo have released them as such.

I know Inquisition had its moments...Varric would stand in front of a Hurlock Alpha taking hits, Blackwall...doing Blackwall things...Irom Bull just standing there when I didn't set up the tactics right.  But Origins was just as bad in all respects.  I remember times when I'd open a door, knowing/ expecting it was a trap just to have my party run ahead and eat a fireball taking heavy damage.  Of squadmates tearing off after genlocks and hurlocks into obvious traps taking arrow fire.  Indeed because of the god awful auto attack system I can't tell you how many times I was literally wrestling with the controls to stop my Player Character from chasing off of them as well...and sometimes I did not make it.  

Though ironically I cannot remember much issues from this happening with Dragon Age 2...
I disagree that we have seen a significant decline in such things, actually I disagree with your entire premise given the evidence.  There have been multiple games from big name developers, including EA, that is either primarily or entirely single player...or at the very least can be played that way.  EA:  Dragon Age Inquisition (last DA game) and Mass Effect Andromeda (last ME game).  Plus Jedi Fallen Order and Star Wars Squadrons.  (And I feel like I am forgetting a few).  Rockstar:  RDR2 and GTA 5. Activision: Call of Duty.  CDPR: Cyberpunk, the Witcher series.  Ubisoft:  All of their major franchises are either entirely Single player or can be played that way.  

Honestly if anything there is still a market for Single Player games...and SIngle Player live service games.  I mean as I am wriging this more examples just keep popping into my head.  Every genre.  Every studio/ developper.  Bethesda would seem to be more the exception then the rule but I don't like them much so...

Honestly at this point I wouldn't be the least bit surprised if DA 4 is entirely SP.  Granted its a bit of a long shot given their last couple of SP RPG titles had a MP mode but recent companies have proven there is still an market to be had for SP based games or games with heavy emphasis on SP.  

Edit:  I mean to prove how much of a market there is for such things despite what te publishers may or may not want EA released the original Star Wars Battlefront game as Multiplayer only.  There was enough backlash against it that in the sequel they included a rather interesting SP campaign, as well as Single Player DLC.  This is...again...EA we are talking about, a company who apparently hates SP games.  

1.  Telling a console gamer that there is a 'mod for that' is like telling someone stranded in a desert to go drink some water.  

2.  This problem was literally as bad...and also non existent in Inquisition considering how Inquisition gave me direct control over my characters and that the AI never went off charging ahead pursuing darkspawn which just happened to turn around upon being sighted.  

DA2 also has it, on PC. Imagine a one of these pirate docks, your party in the middle hole, baddies spawning in several entrances. Your melee party members charging off into multiple directions. Though this can be prevented by adjusting behaviour to something less "aggressive" or going full ranged for a moment. And that was, like, the big bonus of DAO, everyone could use a ranged weapon in a pinch.