Sony supports pairing Bluetooth devices via USB since PS3 and Apple supports this since wireless peripherals with Lightning port.
However the protocols to do that are all proprietary and mutually incompatible. At least the PS3 protocol has been sufficiently reverse engineered so you can plug a DualShock 3 controller into a Steam Deck and have it just work wirelessly afterwards.
However the protocols to do that are all proprietary and mutually incompatible. At least the PS3 protocol has been sufficiently reverse engineered so you can plug a DualShock 3 controller into a Steam Deck and have it just work wirelessly afterwards.