I took the deep plunge and formatted my 64GB SD card as ext4. Perhaps a simple GUI script could be made for this.The PND system needs to be kept, in my opinion, but enhancing it if need be.
Yes, at home my desktop doesn't need that much space - because I don't play games on it.
Games need A LOT of space (for music, videos, etc.), so they should really be kept on an SD Card.
And a normal SD Card is formatted in FAT32 or exFAT these days.
I doubt Debian could use FAT32 as normal storage space (permission issue) and it will certainly wreak havoc in case the card is being removed (which will happen - it's removable storage!)
We've got PNDManager, we've got the daemon, we've got the repo, we know that system works.
Where's the issue installing normal stuff like FireFox and Libreoffice from Debian repos and most games using PNDs?
SD Cards are cheap, where is the issue including a library with a couple of KB size inside a PND to make sure it works with future firmware versions?
Most standard libraries stay downwards-compatible with new versions, so it shouldn't even be a lot of them.
Until no one can provide a way to use standard .deb files that offers the same advantages as PNDs do (config and data on SD, removing SD Carrd doesn't break things, simply copy the PND onto the card using a normal windows PC, etc.), I really don't see a reason to give up PNDs.