Really ? That's your dealbreaker ? MTP has been supported for long time on Linux… Just tried it on gnome and kde, no problem.
BTW, MTP has great advantages from an engineering PoV: you don't have to use a crappy FAT filesystem on your eMMC. You don't have to give full control over an essential piece of storage to another OS, so you can continue accessing data/apps installed on the storage.
BTW, MTP has great advantages from an engineering PoV: you don't have to use a crappy FAT filesystem on your eMMC. You don't have to give full control over an essential piece of storage to another OS, so you can continue accessing data/apps installed on the storage.