The worst is newer versions of android. You turn it up full, suddenly it's down to 3/4's full again and you have to acknowledge you want to turn it up, then turn it up again. If the headphones unplug, you gotta turn it up again.
The same thing happens with brightness too. Turn it up full, suddenly, down to 3/4's again until you acknowledge yes, you really do actually want to turn your brightness up full.
The first time it happened I was outside in the sun and couldn't actually see my screen to figure out why it dimmed again, i kept trying to brighten it and it kept dimming, I finally noticed the popup on the bottom in the brief second of lightness I had after the 4th or 5th try.
I really hate the way devices try to control you rather than allowing you to control them.
On my old rooted android phone from years ago, I had alsamixer installed and could turn the volume up however I pleased, even above the artificial software limits present in all android versions.
I miss those days.