Yes very valid points.

I am thinking of making flashcards with all the styling comments and really internalise them. Its like failing a driving license test everytime I create a pull request. haha...

Anyways, I was keen on knowing if this is a common problem (say like 10% of the population faces or its even scarcer).

I personally have never seen a project fail because the styling was a little off. I have seen projects succeed because they hit the customer early, and fail because they didn't do it a lot better than existing solutions. But then, to be honest, every project has its own flavours to success.