Wildlife concerns: Generic wildlife / constant hostility

If there are Fiends on multiple planets, I suspect there will be a reason for it. For example one version has them covered in the same bone structures that the Kett are covered in, so perhaps the Kett took them from their homeworld, grafted the bone armor onto them, and use them as war beasts. Sort of like how the Blood Pack and some batarians have done with the varren.
We've seen other creatures on the planets so I'm sure it won't just be Fiends every single time. 

There will probably be more aliens that fit the "Giant Space Gorilla" type. Can't let that animation rig go to waste on a single enemy type now.

Well, this is what I think of when I think of fiend:

Well, theoretically a few of their spores could have been caught in the Arks and Nexus and taken to Andromeda unknowingly. 

Personally I think of these little jumpy guys when I hear the term "Fiend":

Theyre gonna be the next varren, believe me.

And those Adhi things.

Those adhi whatevers basically look like varren with a fin attached.Again I don't have my hopes up, if inquisition is anything to go by it'll just be tons of reskins with zero combat diversity.

Sadly, I think this going to be the case. And regardless of "reasons," it really amounts to lazy design choice. It's this sort of lack of going the "extra mile" that gives TW3 fans ammunition in attacking all things Bioware. People can complain or defend all they want, but only Bio can change this dynamic. They have to create a game that rivals or exceeds TW3 to shut people up. And hopefully MEA can somehow pull it off.

No one gives a crap about Witcher fanboys desperately trying to convince themselves that the games they mindlessly worship are better than BioWare's games.

ME:A could be the greatest game ever made and those people will only double-down in their pathetic vendetta. Most of them are only obsessed with screeching about The Witcher solely because they can't stand the fact that BioWare doesn't do exactly what they want and BioWare's games are hugely popular and successful regardless.

Of course, this is already "make complete assumptions and then whine about the game based on those complete assumptions" so anyone who judges BioWare on this complete assumption isn't worth caring about.

'Fiend' isn't a bad name. Who knows, maybe we'll have an R-Blaster; so, shooting 'R's onto 'Fiends', we'll turn them into FRIENDS, and ....... OK, I'll see myself out now.

Anyone who wants to claim a game is objectively better or worse than a different game, especially one of a completely different genre, either doesn't understand what an "opinion" is or is self-centered to a glaring degree.

Personally I suspect that the fiends are going to be the Andromeda version of the thresher maws like we got in ME1. They'll pop up a trandom intervals and we'll have to defend ourselves against them. Much like we had to against the thresher maws. Th best thing to do is be cautious when entering wide open spaces as that's where the thresher maws tended to show up most in ME 1 and I suspect most of the fiends will likely be found in similar areas.