> I don't understand how Codex can blunder so badly. I imagine that even if they would be using vibe-coding, surely they must have some good engineers. So why is there such severe bugs?

I'd say this is also partly a problem of working under intense pressure and the demand to work faster and faster - even faster now with "AI". All these companies are competing with each other very aggressively and are driving their employees like horses in order to win the "AI" race.