By seeing your battery percentage number displayed, you’re able to tell if your battery suddenly starts to drain faster than usual. This would be harder without the battery percentage. This indicator helps you to know if an app or process is significantly draining battery life so you can fix it. Although I guess most phone users aren’t bothered by this I’d imagine

I’ve only ever used Debian my entire life

And actually you shouldn’t use a desktop environment in the first place as you should be editing all config files manually as well as running your own compositor

I would do anything for Firefox to stop making a new audio sink for every tab that plays audio. Of course Chromium lets you have just one sink, so I’m just going to blame Firerox’s implementation of HTML5