What features of hotels have completely vanished?
Pay telephones; bathtubs; shower caps (one of the most surprising things my hotel clients get complaints about on TripAdvisor!); and dressers with drawers for holding your belongings.
For me, the most disappointing disappearing hotel feature is the old-fashioned lobby bar – no theme, only a pianist for entertainment, and men wearing ties tending bar. The best hotel bars have this sense of intrigue and mystery, that something interesting or sinister just might happen any minute.
What would you add to this list? You can also read a lively discussion of disappearing hotel amenities here on Quora.