I think they could do those things with small PRs if they chose. If their agents are not intelligent enough to make small prs, I guess they can YOLO and assume everything is just fine with what the agents did. I do think small PRs would be better for agent review as well though, because they avoid any problems with context being overwhelmed and things being missed/forgotten.

What are the PRs you're thinking of?

You're welcome to do large PRs, I'm not a fan of huge PRs though and would not pretend to review them (as pretending is what it would be), nor would I like to work somewhere where this is the culture.