That seems not a niche feature from my view... Maybe it's a feature that isn't often advertised (amd64 machines excepted). I find it frequently in the datashe

That seems not a niche feature from my view... Maybe it's a feature that isn't often advertised (amd64 machines excepted). I find it frequently in the datasheets (and then verifying with schematics and testing). Another non-advertised thing is "real" LVDS on the same physical pins as MIPI-DSI. Again, datasheets+schematics.