A differential pair driver and receiver would be an extremely important strategic addition that would form the basis of LVDS, MIPI, PCIe and protocols based on it, SATA, USB2, USB3 and more.
That's a heck of a lot of protocols covered, an extremely high bang per buck ratio.
Variants can be to change the impedance eg for DDR3/4 however just dropping in some resistors inline would be a temporary substitute, so it is not so essential (impedance matching on DDR3/4 is absolutely essential and is done dynamically by the PHY)
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