I have put on full body armor and will try and share my experience here:
I have kinda the opposite experience when talking iRacing and rF2.
I find that in rF2 I have an easier time putting in consistent laps over a long period of time.
This is mainly due to all the little subtleties in the ffb. It allows to feel when I'm close to overheating the tires etc.
I can then back off a bit on certain corners until the tires are more sorted, and start pushing again.
The complexity of the ffb in rF2 allows me to avoid disasters before they happen, whereas in iRacing the disasters just happen without warning in most cars.
This is what I find so off-putting about that sim. The lack of "feel" that makes me feel more like a passenger than a driver.
BIG disclaimer: the above is my, personal, subjective opinion.
I know this is a forum which should have room for such things, but a few people are getting extremely high strung these days for some reason.
Kinda get the feeling of being trapped in a pit full of yipping little lap-dogs. Very tiresome and not good for my ankles

I am not talking on behalf of anyone else but myself. So there's no need to get all emotional.