What do you wish for when it comes to degrees of difficulty ?

Looking at the leaks, getting good difficulty levels is even more important to me.

I have seen recently a difficulty level on a hack and slash game, which I was able to play.
It slows down the enemy attacks enough for me to react.
I am really fascinated and positively surprised by it.

Depends on the type of game. Action rpgs I want the difficulty to be about improved timing for things like a parry or dodge, more enemies, better AI. Tactical RPGs I honestly have not found any where I like the increased difficulties as it seems to be more about system gimmicks than difficulty. Ideally it would improve the AI or the enemy so I would have to improve my strategy.

I usually play the Dragon Age games on casual and then Inquisition on Normal so I'm pretty much there already and I expect I'll play Dreadwolf at the same. 

Most games these days are pretty good with their options where you can customize your gameplay. Like some have the wheels either toggleble or you can set it to hold it down. I prefer just pressing the button.

In defence of level scaling from perspective of feeling progress - there are ways other than just stomping mobs on basis of sheer numbers to feel progress. Getting more skills, more passives, more secondary stats like crit or attack speed, all make you stronger outside of just sheer number advantage. They give you additional ways to control and defeat your foes, and make it easier to fight them that way.

Say, take fighting basic wolves as a mage in DAI with scaling on. If you only have winter's grasp, and then have to auto-attack to fill in, it's going to be a lot harder to kill that pack of wolves than if you have say, fire mine array with chaotic focus, flashpoint, and Energy Barrage, and you replaced the single winter's grasp with ice mine array. Even if one of them was promoted/boss level, dropping energy barrage on one (at least one hit will usually crit) and then dropping two fire mine arrays on the will probably kill the whole pack outright, and if some survive, you can freeze them with ice mines and attack until barrage or fire mines are back up.

Level 20 you has a lot more tricks up their sleeve than the level 1 you, while the level 1 enemies are never going to get more than what they already had, even if health/damage numbers remain proportionally the same throughout.

Edit: In fact, I would argue that straight up number increases are the single most boring part of level ups, and depending on the how many of them are there can introduce extra problems.