Excellent point. We started Sept 8th and finished Sept 24th, and those things weren't a problem for us on those particular dates (in that year ...).

It was a bit of a challenge to piece together bus service from Lone Pine to Yosemite, but by being flexible in our starting date we managed that.

We resupplied at Muir Trail Ranch with no problem, and in fact could have done so without mailing anything (there was so much left in the hiker buckets at that point). We took a day off at the little motel/cabins at Reds Meadows and they were still open for that and serving meals, though the resupply pickings in their store were a little on the lean side (but adequate).

Getting a ride from Whitney Portal to Lone Pine proved quite easy; still lots of people climbing the mountain at that point, but it was a family out for a shorter walk that we met on trail that crammed us in and brought us out.

It might indeed have all been harder had the trip been pushed even a little bit later.