You want to hear about good cockpit features/effects from other games that could be implemented in GT and don't suck? Here are some:
-Adjustable drivers seat.
-Adjustable FOV
-Adjustable camera reaction (How the camera reacts to G-forces and so on)
-Mirrors reflect the interior of the car (Not possible in GT, but nice)
-Virtual mirror (switchable)
-Windscreen accumulating dirt, that can be wiped away.
-Stone chips in the Windscreen.
-Camera moves to apex (switchable)
-Switchable drivers arms and/or steering wheel.
-900° steering animation.
Sorry, this looks just ridiculous. Its like a waterfall or something. No thanks.
A windscreen mostly reflects whats very close to it or very bright and oddly colored, its not a transparent mirror.
Even the great Iracing does not bother with it. Because it is annoying.