I think the following specs would be cool:
Front:
2 x Mic Inputs (Mic/Line/Instr)
1 x Phones Output
LCD Display with Encoder (for Gain, Vol of Main Out and Phones, to select stand-alone profiles)
Power Switch (On/Off) to save a little space on the back
Back:
8 x Analog I/O (192 kHz), -10/+4/High Gain
1 x ADAT I/O (192 kHz S/MUX)
1 x Wordclock I/O
Breakout Cable 1:
1 x AES (192 kHz)
1 x SPDIF coax (192 kHz)
Breakout Cable 2:
1 x MIDI I/O (breakout cable)
USB2.0
Features that would be great:
TotalMix FX with FX chip
6 Standalone Presets
AutoSet
IMHO Thunderbolt is not required for such a small Unit, the space for this communication port could better be used to be able to mount breakout cables, so that all can still fit to such a small unit.
Mic/Instr inputs I would be defintively missing from a recording interface.
But then pls, as you demand, 8 analog in/out of the back to be able to have enough for ext. mixer or outboard equipment.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13