As much as standard AA,AAA batteries are nice and common. The issue is that they are not that energy dense. So for a 5000MaH battery you would need a larger space if it where AA's than if it's a nice and flat LiPo pack.
Also our modern devices use pretty specialized charging/power needs which require custom batteries.
Can't fast charge an AA with 120W's of power.
Though I remeber the days a low battery on my gameboy didn't have to mean finding a cable but just plopping some fresh AA's. Felt like reloading irl.
I have the *arr apps running on my homeserver, i manage the backend but everything gets neatly dropped in jellyfin.
Gf is not tech savvy, is very happy about our "homemade netflix", reverse proxied it so she can watch at work too.