Now I definitely know you haven’t seen a real professional codebase.

Extremely wrong. So much for your assumptions.

Professional git repos are full of one sentence commit messages with little to no explanation of what’s in the change set.

Yes, humans can communicate poorly, of course. But people letting the LLMs do it do not understand what is in the change, and the LLM certainly doesn't. There's no one at all to ask because no one understands what was changed or why.

I'll take “sometimes lazy but they wrote it and their understanding of it can be interrogated”, all week.

I used to put messages into my commits “if anyone reads this and messages me, I will give you $5”

Only one has ever been noticed by a coworker and that was like 5+ years after I made the commit