We are die-hard TC sofa evangelists. We have a no-slide 9.5' camper with the sofa-as-dinette staring at the kitchen wall, window to our backs.
We sit in the camper:
1. eating food
2. for short stretches - winding down before bed, talking/ planning...
3. for extended stretches - watching TV, reading, playing games... because it's raining.
We often don't even eat in the camper, and when we do, we're not eating elaborate meals requiring serving bowls. That leaves lounging and killing time - both better addressed by a couch we can stretch out on, put our feet up, change positions, etc. Dinette seating is not a comfortable place from which to watch a movie, IME - especially not for 2 people. We have no interest in a TC without a couch.
Having said all that, I'm big and tall and can't sit up in our overcab bed. I'm also not a "lay around in bed" person. I don't read, eat, or watch TV in bed at home.
If I was more of a "bed" person, a dinette would probably be more appealing to me.