Not working on the “next big” thing but I only recently started finding that AI could solve complex problems for me starting around ChatGPT 5.5. Working on a game engine. Some of the quite isolated modules I’ve had it build are not good code by my own standards. The code has way too many indirections to say the least. But they work without bugs and perform well too (i have a very good CPU and memory management harness for my frame loop). My velocity on the project has doubled at least cause now stuff that I wanted to do down the line is already done. I’m definitely a bit careful with setting up isolated guardlines about which files I let a certain feature touch but with models like Fable even found that unnecessary.
Working code that performs exactly how I want on an outer level is valuable. It can be refactored and rearchitected or reimplemented better by just the virtue of having something to compare against and having the edge cases accounted for.
That seems to be what most of these projects that get accused of being "vibe coded" are doing. Incidentally - there's nothing wrong with writing your own useful utilities, and educational to package these up for distribution/release, but don't be surprised if not another soul in the world finds the particular need you had to be one they share.
On one hand, it's very good advice to be clear about PMF. If you have to ask your product doesn't have it. It'll be servers-on-fire obvious when you reach product-market-fit.
On the other hand two things stick out: 1) for every example that proves polishing doesn't matter, there's a successful exception that broke every rule and succeeded anyway. The founder of Figma for example, said he worked on its foundation for something like 4 years before launching. 2) Internet, consumer tech, mobile, sass are all mature markets and the quality bar is very high at this point. It's not obvious that some novel concept will be enough to overcome sheer inertia of status-quo incumbents.
Ideas are cheap. The execution matters and you need to polish it at least until certain level.