I pretty much agree with each point. That said, I think when you work in the bay - by simply being around other successful founders and investors etc you get motivated and you learn from their mindset and approaches. At least this was quite helpful to me personally. As you say it's obviously pretty bad if its a situation where a founder simply like relies on an advisor and mentor. However, having mentors/friends that you can talk to, that can motivate you, and you can go for advice can be quite powerful especially if you aren't in the bay where there is already such a community.
All this of course depends on the quality of the mentors you can find, and the quality of the fellows - if the fellows are bad the mentors just won't give a shit. And also, this is definitely not a replacement for the personal discovery a founder needs to do