I agree. From literally every standpoint other than "Yeah, fuck this [you] person", it is a bad design choice.
- Communication - as above.
- Strategic Value - those 20 minutes could be spent going over runes, masteries, builds
- Monetary - those 20 minutes could be time spent shopping the store, because there's nothing else to do, and it's kinda like grocery shopping while hungry -- you can't do anything, but you want to, and you spend the whole time wishing you were doing something awesome without being able to.
[slayer-jinx-unamused] bad design is bad, Riot needs to go watch some Extra Credits.