I’ve nothing against your suggestion and understand it, but in reality I can’t really see A&H doing a card that puts more I/O at the console and not remote.
For remote, having less than 16 either ins or outs doesn’t really make sense as the capacity of DX (32 x 32 with cascade) wouldn’t be being exploited. Therefore the DX012 which can do 16 AES out makes sense in the range. If you don’t need all as AES you do have the bonus of more remote analog outputs available for wedges/IEMs.
Perhaps there’s a market for ‘mini’ DX expanders that handle 8 x 8 and cascading to a max of 4? I’ve no idea whether that would ever even be possible!