I'm surprised some people here think a late checkout is used only useful for watching TV.

For me it's the single most useful benefit with breakfast and I've basically used it either for working, taking a nap, keeping my belongings safe, taking a shower.

I'd also add that in the current COVID situation having your own room is a lot more hygienic and allows you to perform social distancing whereas if you're out before noon then it's 4 hours less of either.

I really don't get hotels refusing it either - they have excess rooms available right now, so just leave a room as it is until the following day and have it cleaned then. It's probably a lot safer for the cleaning staff to come in to a room a day later than the same day a person checks out.