Yes, its a failing if we have the luxury of time (and the willingness of the guests) to explore the differences in their coffee.
Otherwise, I think it helps people make better decisions and is a great way to remove any barriers.
P.S. i run a mobile coffee cart. Queues move faster when we reduce our menu to “black coffee” & “milk coffee”, although it is highly dependent on the crowd. Though I do find our guests more proactive with a simple menu.