I want a USB-C hub with at least 5 USB-C ports and no other legacy ports. Only USB-C. An added bonus would be alt-mode video transmission from my Mac and power. Does such a beast exist? Not that I can find!
In any case I'm grateful that the Mac Mini I upgraded to recently at least offers 4 generous Thunderbolt/USB-C ports.
I've heard this second-hand (or third-hand) and my EE knowledge is nowhere near good enough to say how accurate this is, but: Apparently the power delivery negotiation mechanism in USB-C is vastly more complex than for USB-A, so hubs with lots of USB-C ports would need new, more complex chips compared to equivalent USB-A hubs. It already took a few years for reliable hubs to turn up when we first got USB 3.0. I'm assuming the manufacturers might also be trying to hit USB 3.1 Gen2 speeds at the same time as supporting USB-C, which presumably further tightens reliability tolerances. I'm guessing with all that, they might not be able to hit the desired price points with this stuff yet, and all that complexity probably also takes a lot of power so bus powered USB3.1 hubs with USB-C downstream ports are presumably a tricky proposition too.