There is one therapist on here whose opinion I find informed and useful (and crucially not with any kind of a superior attitude).
Another therapist joined a while ago and presumptively announced that they were here as a therapist to give insight and answer questions. The tone of their posts was incredibly superior and disconnected from the purpose of this site. I agree with Crocus wholeheartedly that anybody coming on here presuming authority could cause more harm than good.
Personally I have learnt more from, been provided with better advice from and felt most supported by other clients on PC than anyone else (along with my current T, support-wise).
This is a support forum used primarily by clients, and presumptive advice from a therapist would seem not altruistic, but self-serving and egotistic. (And I say this as a user of this forum, notwithstanding my position as a trainee therapist).