Magical universes all have some way of limiting how much magic you can do. Perhaps you have to prepare spells before using them, or draw on local Mana, or perhaps it just tires you out when you do a lot. But there's a big difference between Harry Potter going about the day casting spells as is convenient and a D&D wizard carefully rationing their prepared spells. One gives you a world in which magic is ubiquitous and used casually, the other a world where it's used only when important.

Getting a new phone with better battery life [1] feels like moving between these universes. Now I can just use my phone when I feel like it, not worrying about what else I'll need it for later in the day. Similarly I don't have to think about places to charge it while I'm out or traveling: I just plug it in every night. Removing a need for rationing has been remarkably freeing. I should have done this sooner.

[1] My new Moto X has much better battery life than my Galaxy SII ever did, and by the time I switched the SII didn't have the capacity it used to.