I'd only put epub and PDF (and only because it's not worth trying to convert a PDF) on a non-Kindle ereader.
And audio only on my phone / PC / Tablet. There are better phone apps for music or audio books than most dedicated audio players now. Also because the screen blanks the eink has no battery life advantage doing audio. And it fits in your pocket more easily (my smaller eink ereaders don't do audio anyway).
Unless you have no PC and are only downloading direct all the formats on a Pocket book are a bit of a gimmick.
My ereader charges when I connect to PC. I want backups. An ereader is more easily lost, stolen or broken. So even if I did download direct I'd want it on my PC and from there backed up. Especially bought ebooks.
I'd maybe buy a Pocketbook if Kobo didn't exist in current form.
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