I think you misunderstood the intent. Constantly optimizing your toolset instead of building a startup with what you already know is a very common form of bike shedding and is one of the hardest things for some developer-founders to get past.
The goal of a startup is to build things quickly, so actually being able to build things quickly is important. If you know a set of tools well you can work quicker than using a perhaps better set of tools that you do not know well. That is an important point to make to people like me who like playing with new toys
I build things quite fast with flask and bootstrap, perhaps now with fastapi. If I have spare time I'd rather spend the time validating ideas or tech in new domains rather than learning more new tech that's just similar to this.
