The major difference is that one is basic clothing and the other is something you just have with you. I shouldn't have to buy special clothes to fly. (I happen to own a pair of athletic shoes as well as boots, however, my spouse only owns boots. We don't invest much in clothing).

On the other hand, I don't really find it to be much of a bother. My boots stay on decently without tying the laces and I can usually do a proper lacing when I'm out of the way.