Except, it kinda is for people that have the right background and are well suited to it. That is, the reason I think you're getting a lot of pushback is that many folks are just inherently risk averse. There are people who are smart, know how to work hard, and know that if they have a path laid out in front of them, they can succeed.
For entrepreneurs, there is simply much more variability. You can be smart, work hard, do everything right, and still fail in unexpected ways due to things outside of your control.
I don't think entrepreneurship is bad at all, but it's not surprising at all to me that people who want to go the FAANG route aren't well suited to starting their own business.
Starting a business is NP hard. At the end of the day, you have to convince people to give you money in some form and way, and that is not a guarantee. You could land on a lucrative idea, or you could do trial and error, failing every time.
Furthermore, once you have either, maintaining a FAANG job is much easier than maintaining a business.