It's definitely a thing. I've had to exercise more and more restraint along these lines. That said, side missions are also very fast to get through, so what you really need is a good issue tracker or work queue that you can run agents on immediately after the main quest finishes.

We are absolutely seeing this at SoFi. MR count is roughly constant, but MR size is growing. More AI means larger MRs - correlation. I find this in my own deep dive work using AI. Working on @steve.yegge -inspired dev pipelines and trying to get them to naturally create smaller units of change against a validated/working product to avoid too much code at once. Seems just as important for AI not screwing up as humans.