I just spent 12 hours a day vibe coding for a month and a half with Claude (which has equal swe benchmarks at gemini 3). I started out terrified but eventually I realized that these are just remarkably far away from actually replacing a real software engineer. For prototypes they're amazing, but when you're just straight vibe coding you get stuck in a hell where you don't want to or can't efficiently really check what's going on under the hood but it's not really doing the thing you want.
Basically these tools can you you to a 100k LOC project without much effort, but it's not going to be a serious product. A serious product requires understanding still.