As long as we keep in mind that "label[s], pigeon-hole[s], and categori[es]" don't have to be permanent, and that people usually change as they learn, I don't see a problem with them.
You can't really draw a line between "experimentation" and "commitment", as commitments usually become experimentations in hindsight. Unless we live all our lives in private, and only went in public when we were 100% sure that our positions about everything would never change (and that we're happy with them), I don't see this working very well.
Sure, we all make a lot of mistakes when starting something new, but this is not a reason to do these things in private. Not only does it probably slow down the learning process, but it also increase other people's expectations. If we no longer see people making mistakes, we'll start believing that mistakes are bad. If we have to hide whenever we do something new (as encourage by the privacy movement), we'll probably just stop experimenting new things.