[normie3000]

> I'm trying to be more intentional with my tech choices. I want devices that do one thing really well, and that when I'm done with that one thing, I can put them away, and do something else. I don't want everything to follow me around everywhere.

Sign me up.

I would like an audio device which can play mp3, podcasts, internet radio. Bonus points if it supports some kind of cartridge system, size between credit card and audio cassette. Thank you for your attention to this matter.

[CharlesW]

You have hundreds of options for devices like this. Amazon alone shows 200, or well over 300 if you don't need live internet audio streams.

You're about to respond: "But many of these use Android, and general purpose computers are too distracting for me." In that case, you'll need to forego live internet audio streams and buy a closed option with a radio receiver.

[Rotundo]

> I would like an audio device which can play mp3, podcasts, internet radio.

Get a second-hand Apple iPod Touch, remove all apps you don't need.

For just mp3 and podcasts: get an iPod Classic (or Video) and install Rockbox.

Rockbox is amazing.

[skydhash]

> I would like an audio device which can play mp3, podcasts, internet radio.

That internet radio is a whole magnitude of complexity, especially with the need for wifi (cellular?) if it needs to be portable. But there are options like specially modified android devices.

I have the Shangling M0 with a 512GB card. I don’t even bother with converting my flac files. A nice other device is my kobo. It holds my entire fiction library with space to spare.