Just like there's no excuse for having standard cars in GT7 (even though we don't know what "standard" will look like in GT7), but that's another story. No interiors and low resolution cars shouldn't even exist in modern racing games such a Gran Turismo.
Simply put, PD are cutting the visions short. The visions are not complete until the entire vision is represented.
Don't want to assume anything, but whatever it is it's terrible! If the interiors are completed, or even ingame (doubt that, whistle snap probably would have dug them up by now), then there is no good reason to not have them available!
Personally though I use the chase cam most often, so it doesn't bother me as much as it does other people, but I still will occasionally use cockpit view for the fun of it and to not have the interiors ready to use is really dumb.
Have you both thought about that prototypes in real life usually don't have finished interiors to begin with? That's quite a good reason for not to have them in the GT series, if you ask me.
When creating a car one of the very last things to make is the interior and that design changes a lot through the process, hence why prototypes don't come with a complete interior to begin with. At most they have a lackluster placeholder, with complete interiors being reserved for the consumer version.
In other words, not all cars have (definitive) interiors. Sound weird but that's how prototypes are, including the Vision cars. With that said, you can't represent or model something that does not exist.
Other good reasons for the Vision cars correctly not having interiors are that:
1.- What you see on the pictures on the OP are mere incomplete and really simple sketches; "placeholders" (just like the interior of real life prototypes). That means if you want the Vision cars to have interiors it'd mean a huge extra job for the manufacturers or that PD itself would have to invent them, none of which is going to happen.
2.- For consistency's sake all Vision cars would have to have interiors, not just some with it and others without it. It's all or nothing, which in this case ends up in none having them. On this regard I have to repeat what's written above: the only Vision car that has a somewhat finished interior is the Toyota one....but is copypasted from another car. All the rest just have a mockup in place.
3.- Finally, lets say PD decides to just model those really simply sketches anyway, At least to me that would be really mediocre, making the effort worthless. I don't know how people here are demanding just some generic wheel and some unimaginative structures without anything else, because that's what those pictures show, not a "Vision".
