Well they haven't found that balance very well. The rear screen is unnecessary (but I am sure costly) and these days is hardly a 'hype' item (note, it'll probably turn yellow from the sun through the rear window anyway).Cost reduction - replacing all physical controls with capacitive touch saves money per car.
If only Tesla cared about the opinions of those outside the internal 'yes men' group, I am sure a quick poll would have shown customers prefer a full 360 surround parking camera set up (like nearly every new car seems to have these days) to a rear screen that will entertain the kids while they sit in the back looking at their iDevices.