Senior engineers have been 'vibe coding' for over a decade before AI. Think what they do, they look at PRs all day and comment. Magically the code change reflecting their comments. It's the same thing now but machines are doing it, not humans. The issue is that junior engineers have no experience working like senior engineers. The reality is that it's not that hard to work in this way. There is no excuse for software companies not being able to re-train their more junior engineers to work this way.