*cringe*
This is the worst. Any serious puzzle should have to be solved only once. You've already proven your ability to solve the puzzle; why must the tedium continue?
Because it "makes the quest more difficult". Sorry, repetition does not equate to challenge.
But another thing that really shouldn't exist are "Touhou Rooms". That's the best idea ever *sarcasm*. I think it's safe to say a lot of people do NOT like the idea of mandatory damage taken as in many quests, every little bit adds up.