I would think the only thing they would abandon with their designs so far (based on their youtube series) would be the expansion card size. It should be credit card width so they could have smart card authenticators integrated into an expansion slot. It would have then made the SD card issue moot but would have made the other cards less space efficient.
Since smart card authentication is literally the only thing I can think of never fitting in an expansion slot, it could also be integrated into an input cover which doesn't have that design restriction.
I would think the only thing they would abandon with their designs so far (based on their youtube series) would be the expansion card size. It should be credit card width so they could have smart card authenticators integrated into an expansion slot. It would have then made the SD card issue moot but would have made the other cards less space efficient.
Since smart card authentication is literally the only thing I can think of never fitting in an expansion slot, it could also be integrated into an input cover which doesn't have that design restriction.