When people say unbuckled, what exactly are we saying, completely undone, or just with the latch lifted up? I am generally unbuckling my 2nd and 3rd buckles all day for lift rides, then snapping them back down at the top of the lift. I have high arches so the third buckle (counting from the top) can really start to hurt on the lift ride, especially when there's not a foot rest.
Sometimes I'll forget to buckle them at the top, so I'll ski a run with 1 or 2 buckles 'undone', but really the hooks are done, just not snapped down. I can't imagine skiing with the whole boot just completely unbuckled.
I kind of have a whole routine with putting my boots on as I would imagine most of you do. The 1st and 4th buckles are generally just snug and I don't mess with them most of the day. I usually do my top buckle and the velcro strap loose first. Then I do the 2nd and 3rd buckles just on the first rung which is loose, then the toe buckle which is snug but not too tight. Then I come back and do the 2nd buckle tight which then loosens the top a bit. I get the top buckle re-adjusted so it's snug, then I wrap and snap my pants just below the top buckle so it will not be touched until lunch. Then I crank down the third buckle and do a few flexes making sure everything is tight, then I 'unlatch' the middle two buckles whenever I can during the day (usually in the lift line and on the lift). When I forget to buckle down again I usually end up slamming my toes hard enough that I'll stop and buckle down. But if it's a just a cruiser run to another lift or a run late in the day I might stay unbuckled.