The sticker/tape solution means you've made the choice to remove the seat post entirely when you move the seat. Since seat posts historically have been greased (to prevent galvanic action between the aluminum seat post and the steel/titanium/?? frame), that can get messy.
Most people, when they stuff their bike into their car, drop the seat post all the way into the seat tube, rather than removing it, and that can peel a sticker off (worst case, inside the seat tube).
On the way to a trip these things are trivial, but at the end of a trip, every little problem is much more likely to get on your last nerve, so finding solutions that take care of future you is a useful investment of problem solving. If it's raining and you're covered with road rash you don't want to deal with your greasy seat post for the 35th time on top of it all.