Right. But as you place your camera closer or further from the background, you will see more or less of it. We're talking about making do without an adapter. Distance from BG to SUBJECT to CAMERA can be adjusted. A big thing about angle of view is how much BG can we see. Well, that can be adjusted without a 35 adapter.
The problem that you will run into when shooting interiors is how far you can get away from the subject etc etc. Just as well, the entire thing ends up looking like exactly what it is: shot nearly completely telephoto and very deep DOF.
However, a wide angle adapter looks pretty nice on an HVX still and helps out a lot. I could see using a Wide Angle instead of a 35mm adapter, just wouldn't be my choice personally.
Edit -- Jack beat me to it. Agreed with Jack. The Time issue depends on who's shooting and which adapter as well.