On most (all?) kobos, you can also upgrade the storage to whatever you want because it’s a microsd card slotted into the board. Just copy the system partition over to the new sd, expand, done. Mind you, I never needed to do it because 4 or 8GB is a ton of ebooks. I’ll probably never need that much space anyway. But if you’re reading larger files, might be handy.
It was, especially since I consider that a hindrance to using the newer devices for 10-years, which the older ones can happily do with a properly-imaged new SD card. Even though I love my Sage, it makes me consider whether I should grab a Libra 2 if I ever see it on the cheap, just to have a comparable device that still has the memory on a SD card.
The Kobo's that just launched claim they will have better repair-ability through a partnership with iFixIt, so maybe we'll see how that impacts the ability to change the storage.