It would be so nice if the AI could back off just a little bit in the Endurance events, yes. With no way to repair your car, 35 minutes is a LONG time to deal with damage. I don't mind if it happens now and then, but when you have to restart 8 times just to get through the first lap and then get smashed 6 or 7 minutes in... well that just gets old really fast. It's a bit more difficult to schedule a 40 minute race than the usual 20-25 minutes as well.
Then again, they could be a little less rough in all of them and I wouldn't mind. They usually aren't too bad about shoving and rubbing and barging in the early open-wheel events I've run but they still are of course prone to occasionally just not seeing you or attempting a completely impossible dive-bomb pass. But in the other series, between the AI's general foolishness and them all being 10mph faster in a straight line than you(actually that seems to be exaggerated even more in Endurance, but I may be mistaken) and then you throw in Ravenwest being corny videogame bosses instead of just a really good racing team, things can get pretty ugly from time to time. That's just racing in the land of GRID, I guess.
Doesn't help that I seem to have trouble keeping up with the bots in the low-level teams' Aston and McLaren I've been driving of course.

I really don't understand why it seems so much harder in that one discipline. In the other series, if I just keep my car in one piece and keep the major slides and off-track adventures to a minimum I'll be battling for a podium if not fighting for the win on Hard most every time. But so far in endurance I'm doing well to finish mid-pack(and I mean 8th-12th mid-pack, not 4th mid-pack

). And yet I've read a number of mentions of Endurance being the worst for slow AI. Oh, well... gotta get better.