It's not always going to remain limited to 5MB, which is probably much enough for an opening repertoire anyway. Also it shouldn't be too hard to create an expo

It's not always going to remain limited to 5MB, which is probably much enough for an opening repertoire anyway. Also it shouldn't be too hard to create an export/import button. I'd argue it's more reliable than having your progress stored on a server that can close anytime, as memchess did.