I think it really depends. There is definitely some good info out there in some places (although I couldn't point you there off the top of my head). The questionable advice based entirely or almost entirely on anecdotes definitely is a thing that happens though and it really annoys me.

The most recent example I can remember was someone with a pretty large platform on Twitter saying "i would highly recommend all trans women get up to AT LEAST 8mg estrodial [sic] ASAP" (direct quote). Like even ignoring the fact it doesn't mention how you're getting it (although in this case I know they mean oral or sublingual), it's just such an absolute statement to make for no reason other than like, your own experience. I got into the target range on less than half that dosage, but I'm not going around telling everyone they need to have my dosage. Yes doctors can suck and you should probably know enough to see if something isn't right and advocate for yourself, but your doctor not immediately putting you on 8mg is not an attempt to sabotage you or whatever.

I think people have been starting to wise up to his shit recently, but everything surrounding Dr. Powers bothers me too. Even aside from his terrible politics and transphobia, he just likes to make pronouncements on the right way to do trans healthcare based on not a whole lot, and because of his sort of celebrity status I've seen a lot of trans people just take his word and run with it. In some cases you can't even tell if you didn't already know that it came from him, because it ends up passed around as just like 'general knowledge'.