There is a "sweet spot" with it- where you don't let them take control, but rather have them off in a room, or ask them to "step back" so you can have a conversation. "merging" with a protector is tricky to work out of. with practice can be done. Do what is best for you though. Some people feel relating to it all as "ego states" is better than dealing with parts--but for me that was extremely rejecting of myself. taking a piece of paper and writing them out, what they do etc. was helpful for me. "all parts are welcome" is important, but unfortunately, my old therapist would say things like, "i don't think I like this part, you shouldn't either" and then he'd laugh, but it wasn't funny. so I gave up on therapy. too hurtful.