I think it's an excellent idea to continue therapy after getting a letter for hormones. Such a good idea that my prescribing doctor made me sign something affirming I would continue therapy after obtaining T, and he does so with all of his trans patients (50+). I think it specifies a certain number of months - just a few. At any rate, even if it wasn't for that, I'd be continuing therapy for years. Not just because I have psychological conditions and some unfortunate family dynamics... for heaven's sake, I spent all of my life in the wrong body, called by the wrong name, treated as the wrong person, and terrified I was going to be disowned by half my family. There is no way after all that I'm going to get a magic letter and skip off into the sunset. And honestly, I think after those sorts of experiences, few trans people will be able to, or should try to do so.