In piston engine and rotary wing aircraft the needles on analogue gauges vibrate visibly. Different engine speeds create different frequencies and amplitudes of movement. The instrument cowling, sticks, levers and yokes all shake and vibrate, making the aircraft feel alive.
Currently everything is static, unless a third party developer does a tiny amount of vibration on engine startup as a little gesture.
Adding all this vibration would add a huge amount of realism, especially in VR. This effect could potentially be turned on and off in the settings.
The vibration and oscillation of the RPM and volt meter would definitely be welcome. Anyone who’s been in a clapped out trainer has seen pretty much everything vibrating in the cabin hahah
That would definitely breathe some life to the aircraft.