No EHD capability for 222k, now what?

All right you guys or gals! These statements are not right.

612 has internal tuner (not removable), 722 has add-on module for dual tuner for 2 antennas that has to be purchased.

The 722 is just like the 612, with one internal OTA ATSC tuner. I know this for a fact because I own both. It's the 722k that takes the MTA2 module.

The 211/211k software is only approved for up to 1 TB at this point..
No, that has been relaxed to 2TB with a firmware upgrade. I don't own one of these so I don't know with metaphysical certitude. But there are release notes which say so, and some customers have reported on satelliteguys using 1.5TB drives, so I'm pretty darn sure.