To be fair, I think Anthropic/Claude started doing CLAUDE.md before AGENTS.md was a thing.
I'd say if we criticize that they did not think that far ahead, we are still pretty fair.
I strongly disagree. It is extremely annoying when I cannot make different agents read a different prompt file when I needed to tell them different things. Cursor currently autoloads AGENTS.md without a way to disable it and it sucks.