I think it's important for a T to have many tools to choose from, as each client is different, and what works for one may not work for another. At the same time, I think it's important that they have some sort of over-arching philosophy for their treatment style. So, I guess it's possible to have too many specialties or approaches, but only if you can't tie them together with some sort of overall framework. If a T is just learning all sorts of different approaches and applying them willy-nilly, then I can't see how that would be useful. If a T is knowledgeable about multiple therapy models, and can say "for x issue, I typically start with y approach, but if that doesn't work, I'm comfortable using a, b, or c approach" then I think it's a good thing for them to be familiar with many different therapy models to best help their clients.