I have very similar experience. I vibecoded a foreign language practice app for myself. It works decent from functional perspective and I don’t see too many bugs. But the biggest productivity constraint I see is the time I need to spend using it in order to understand what is working and where the issues are.

My newest joke is:

„I was able to vibecode those 5 apps I always wanted but never had time to code them myself … it is so different now because — I don’t have time to use them”.