I am new. What is wrong with the Agile/Xtreme stuff?

The snake oil salesmen who turn it into a religion/cult. The ceremony that doesn't bring any advantages. The irrational adherence to this ceremony.

"Agile/XP" is a big bag of many ideas. Some of them aren't related, but they all get stuffed in that bag.

Personally, I enjoy pair programming, which is the literal experience of dealing with an (agentic) AI for the purpose of programming.

Tests (regression tests, unit tests, integration tests, ...) make development easier in that they tell you right away when you took a wrong step. You don't have to test manually anymore, so that saves you time and concentration, and you can test a lot more often.

Those are the good bits of "Agile/XP".