Thing is, the most important said realistic mechanics of Realism mode are half-assed and end up not being realistic at all.False dichotomy. I have a simulationist approach, my view is that the top priority should always be mechanical accuracy. If you get the mechanics right, the gameplay will derive naturally from that. If there's something wrong in the gameplay, it's because you've forgotten an important mechanic, erred in its implementation, or intentionally left it out for other concerns.
I'm more likely to excuse or overlook people doing right things in wrong ways than doing outright wrong things. For example, run & gun doesn't bother me. It's within the realm of possibility, and that it's more common than was historical is clearly a consequence of a modern gamer's experience meeting up with a lenient death penalty; aka, things outside the intended scope of the game. But phenomenon like how in Classic mode, you're frequently more accurate when hip-firing than attempting to actually aim, that feels so ridiculous to me that it's almost offensive. Fake mechanics like that also tend to backfire, in that it's just as likely to produce a patently artificial unintended result as it is to create the desired outcome.
-Yes, a normal athletic person can run as fast as our avatar, but only if they are wearing sports clothing and shoes and not carrying 10kg of equipment. Moreover, there's no inertia in the game. Players accelerate from full stop to max speed of sprint in less than one second and decelerate just as fast. That's just not possible IRL. Also, terrains has no influence on sprint speed, but that's a problem of the game in a whole, not just the mode.
-The speed of entering iron sights is kinda realistic in Realism (only at level 0), but only when you are standing still. When you are jogging, it's should take as long as it takes in Classic, and when you are sprinting, it should take much longer than that, especially for the Germans, whose weapon is being carried in only one hand and by hip height. I use iron sights all the time in Classic in CQC, but you can't go sprinting through tunnels and corridors like you can in Realism in real life without getting a bullet in the head. The extremely unrealistic speed of bringing sights during sprint is what saves you from that and sometimes makes it even more effective than advancing slowly.
These two combined destroy the mode for me, turning it into a run 'n gun fest where every soldier is a super soldier. Yes, run 'n gun is realistic IRL, but it's suicide and not effective at all, while in RO2 Realism, it's the most effective thing one can do in CQC. Until that issue is solved, I'll stay away from unRealism.