You can't fit comfy in anything though so that's a moot point.
You'd complain about the rear seat space in an S-Class or a Range Rover..but not a CT6. 🤔
If they were doing everything to cut corners, it wouldn't have been the first Lincoln to have its own switchgear and engines not used from a Ford.
"The expansive rear seat provides plenty of room for passengers to stretch out, and options such as our test car’s $4300 Rear-Seat package make for a sybaritic experience back there, with heating, cooling, power-adjustable lumbar support, and powered recliners for the occupants. " - You're just massive
"All of the cabin's touch points are high-quality; Lincoln has created its own switchgear for the Continental (and eventually the rest of the Lincoln line) with knurled-metal control knobs on the steering wheel and A/C system, and unique turn-signal stalks. Just about the only Ford-style switchgear I could find in the cabin were the window switches on the doors, and the overhead storage binnacle mounted just forward of the optional panoramic moonroof. "