Problem is that even on a premium product, cost is gonna be a factor. Well, and weight.

I can think of a bunch of features that could be supported in a controller. Problem is, not everyone is gonna want everything, and if they put it on the thing, everyone is gonna pay for it. On the XBox Elite Series 2:

• Interchangeable thumbstick hats: Yes

• Interchangeable D-pad hats: Yes

• Interchangeable thumbsticks (a la the Thrustmaster eSwap): No

• Rumble motors: Yes

• Haptic force feedback (a la the Playstation's DualSense): No

• Gyros (a la the Playstation's DualSense): No

• Force-feedback triggers (a la the Playstation's DualSense): No

• Hall Effect triggers: Yes

• Hall Effect thumbsticks: No

• Extra back buttons: Yes, 4

• Extra face buttons (a la SCUF Envision): No

• Force feedback thumbsticks: No (I'm not aware of anyone that makes these, but force feedback joysticks were once a real thing, useful with flight sims simulating pre-fly-by-wire aircraft, like the Microsoft Sidewinder Force Feedback 2)

• Pressure-sensitive buttons (a la the Playstation's DualSense): No

• Bluetooth LE: Yes

• Wired: Yes

• RGB LED: Yes (though apparently the XBox hasn't historically provided access to this and Steam Input does; I don't know if this has changed).