Wells are a stupid idea

Every single time I change my flask in town I never remember to go to the stupid well and I tp back into action and I have no flask charges and I die because of it. EVERY SINGLE TIME. I don't understand why I need to remember to go to the well because the flask is empty when I switch it in town. Just why? What's the actual point of this mechanic? Same goes for charms. Flask and charm charges should actomatically refill when you enter town and they should certainly not be empty when you switch to a new flask/charm in town.