The only things I own that still take AA or AAA batteries are a wireless mouse and a pair of noise-cancelling headphones. My other devices either use proprietary batteries (like my camera) or don’t have user-replaceable batteries at all (like my phone and my laptop).
When I was growing up in the late 90s and early 2000s, I needed those standard-sized batteries for a bunch of things:
- Radio, Walkman, or CD player
- Graphing calculator
- Handheld games
All of these are just functions of my phone now.