But there is no 'other' open standard yet, although Intel and other vendors are pondering it [1].
This doesn't mean that HDMI or DisplayPort can't be shoehorned to do it and you can't carry those over the USB type-C plug, but they're meant for other things. This type of 'let's invent one that meets our needs slightly better than the 5 others' is what leads to standards proliferating (and I'll avoid linking the xkcd).
