64gb can fit around 700 hi res flacs if we assume an average length of 4min. That’s more than 40 hours of music before you’d be repeating. I don’t have this device but I have 128gb storage and I only have 1k songs I love so it’s not even full.
The purpose for most people is just to use the phone less, not replace it entirely.
I went back to my mp3 player for music because I found that when I was streaming music I would start skipping tracks all the time and basically just listen to the same few songs even though I could have listened to literally anything, which is apparently a quite common thing called choice paralysis.
Plus while I was skipping tracks, I would also start reading the notifications on my phone, and then I would start answering the notifications and basically just use my phone when it wasn’t necessary.
Now I have a smaller selection of songs I really like and I don’t skip around on my mp3 player and I also have no incentive to use my phone while listening to music.
Also having to open this device to replace the SD card is a bit off putting. I understand that you also have to open a traditional iPod to replace the storage, but this is neither apple nor the early 2000s. My mp3 player has an easily accessible SD card slot on the side and I don’t see why this device could not have one either.