Well I dunno actually. I think it's more a fear that you're obliterating yourself when you make those changes. In actual fact, all you're obliterating is the 'you' that they've gotten used to. They erroneously think that what they're looking at right now is you, but it's not, it's just one part - the changes are you, they're what you're all about, not any one particular look. By making those changes you're being more you than ever, and if forced to stop making them, that would obliterate you.
btw, my younger sister had a mohawk too, and she's ENFJ Her and my other sister couldn't be more different - one super conservative and vanilla, the other... well, she's just different, that's all. Like me... and yet so not like me! LOL
edit - if you're a strong enough person, a person with real charisma, who can pack a punch (metaphorically), then the essence of who you are easily remains visible throughout any physical changes. It's a bit like I remember someone saying over at INTPc a while back about people's avatars - some are fused in readers' minds to their avatar, some don't match their avatar, whilst others have established a strong enough personality to still be 'them' through any avatar.