I'm still clinging to my dying Clip Zip with Rockbox, I really hate that the concept of a tiny kickaround "MP3 player" that doesn't suck is pretty much dead because phones took their place for the vast majority of people. Manufacturing in general seems to be limited to gimmicky hipster bullshit (Pono) or overdesigned loaded audiophile toys (Fiio) (unless I've missed something neat). Cheap Aliexpress players like Ruizu's that attempt to fill that niche fall apart when your eyes begin to focus on it, but the inability to use Rockbox on any of these is the biggest dealbreaker. Rockbox is a really nice firmware, but the players that let you use it best haven't been made in a decade or more, so you need to play eBay roulette for them, and they're getting pricier because of their finite nature. Because of this, the Rockbox project will eventually die as well, that's gonna suck
The hardiness aspect is what makes the Sansa stuff an especially big loss. My Zip has a some bad sectors on the internal memory, so it likes to crash once in a while. The battery only holds 65% of what it used to with voltage drooping a little, so it has issues accessing micro SD cards on anything other than a full* charge or connection to a power bank. The buttons are starting to go, but at 12 years old, that's pretty tough, and it's still a snappy way to play literally all my music with loads of options, and still does a lot more than anything I can find on my phone, the DAC is also somehow better too. It also survived a couple washes. I guess Android Foobar is okay? But also sorta useless without components like on the PC, and to build on the touchscreen stuff above, going from tactile buttons you've been using forever to a touchscreen for music is miserable for things as basic as play/pause or seeking
It sucks we never saw Rockbox on the Zune, that was great hardware chained to some of the worst software in the world, it's like Microsoft set out to make an even worse iTunes with playlist/transfering issues to match, what an embarrassing fucking waste of Wolfson DAC's. I assumed if we were Jtagging our 360's, something like the Zune had some security fuckup we could exploit too, but as it turns out, nobody else bought a Zune, and there was a reason no first-world nation hosted most Xbox mods. Any hypothetical Zune port would be illegal in Microsoft's eyes since nothing's running without pulled keys, and the fact the fucking thing doesn't even work as mass storage device means development would be a giant pain the ass for a niche player. It's pretty much the same shit that killed Rockbox on gen 7+ iPods, it's a "device" now