Well it must be super frustrating for completionist, or people who spend Kobans to refill stamina. Pay so much, give it time so much, get nothing in return.
Personally, I'm fine with it. Get girls? cool. Can't get? okay. HH is more of a time killing game while waiting for other games stamina anyway. And with me recently start with Girl Symphony on DMM. I think I'll give up on HH entirely. The stamina stack on level up is very high that you can play continuously and you will level up again in no time. So technically it's infinite stamina for at least first 50 levels by my calculation.