I just think "putting someone in a box" is such a negative way of describing typing people. I think, as has been said, it is a tool that can be used for construction or destruction. If you're worried about it just make sure you use it right.
Do not use it to justify your own actions as you will only make yourself more unbalanced, but if you use it to understand why you are they way you are you can correct yourself. Also, when you use it to type others it can give you an understanding of why people might have a different view than your own.
Many or even most arguments are not a right vs wrong. They are right vs right. The criteria is just different. MBTI gives me an understanding of those different criteria people use in their speech and actions. It gives me an understanding of why people do things which appear illogical to me.
I would describe typing people as a way of understanding people. It's just another tool we can use to do so. I don't see how we are "pigeon holing" or "boxing in" anyone by using it.