when we did Whitney this year, on July 22, there was quite a bit of trail work being done on the 99 switchbacks. they never made anyone stop and wait, but you never know, it depends where they are in the process.
also we saw a couple WAG bags left on the side of the trail. I sure hope the owners were planning to pick them up on the way down. Please don't do this, its unsightly to say the least.
there were also items of clothing deposited along the trail. are people so out of it from the altitude that they forget their clothes?
not the most pristine trail I've been on in the Sierra.