> So from my perspective, nothing changes regarding ownership.

The engineer who worked with you took ownership of the code! Have you forgotten this?

No, that’s why I wrote “from my perspective”. I started long ago writing 6502 and 68000 assembly, later c and even later Java. Every step you lose ownership of the underlying layer. This is just another step. “But it’s non deterministic!”, yes so are developers. We need QA regardless who or what write the lines of code.