A device such as this barely obsoletes as long as the audio codecs can still be handled; you can easily switch batteries on these relatively "simple" devices, too.
I live by my Sansa Clip Zip. It's amazing that nothing as good has been released since. It's super light, with rockbox it works extremely well. Sound quality is better than my phone (pixel 4a). Only gripe is that it doesn't support ext2,3,4 or similar and I'm forced to use fat32.
A device such as this barely obsoletes as long as the audio codecs can still be handled; you can easily switch batteries on these relatively "simple" devices, too.