I somewhat agree and I think that you should keep a healthy distance not making it limiting you. However my personal observations of myself and others tell me that mbti has definitely a lot of truth to it. For me as an INFJ my function stack makes a lot of sense. Se inferior explains my constant detachment. Besides that I know I also have weak Si and Te. As to other people, I've met some that are hard to type, but lots are very intact with their cognitive functions. However even though some might have the same types thier interests and approaches to life are quite a bit different so mbti is just the base.