I disagree with any decision that sacrifices gameplay for graphics.
Ever.
Period.
Having an interior to play on is an extra gameplay feature that, while it doesn't add a lot, definitely adds SOMETHING that bricks don't. I don't give two stuffs about shadows and shaders.
On these grounds, I am opposed to the change until such time as those "new features" vaguely hinted at are extant. I would strongly urge you not to release any patch of this nature until some kind of new feature is actually done, something that replaces the availability of bedroom and kitchen interiors, so this isn't a straight downgrade of gameplay. This should not be that hard. You could add almost anything and it would make up for losing interiors, as long as you add something.