It is no more unsafe than any other strenuous exercise program or any other activity that involves exerting oneself seriously. As for quality, of course quality varies - no HQ can ever ensure every coach is good and of course following one specific methodology by itself does not make the coach good. In fact, I was always told (not in CF but in other training context) many times that choosing good teacher is more important than choosing style/methodology - styles have their merits and demerits, but you can only appreciate them if your teacher is good.

So if the point is that you need to approach CF carefully with an eye for a good teacher - this is absolutely true.

>>> Personally, I think if you're lifting some multiple of your BW in any capacity

Hopefully, one day :) So far I don't think I have reached 2x of my BW in any exercise. But I'm working on it, let's see what comes of it in a couple of years :)