Why can't I find a USB-C hub with multiple USB-C ports?

2021:

Thunderbolt 4 hubs are now available, which for the first time allow for USB-C / Thunderbolt true multi-port hubs.

Discussed in the answer below:

Thunderbolt 4 - available 2021

2016-2020:

The chips needed to produce one-to-many USB-C hubs essentially did not exist prior to Thunderbolt 4.

Some of the same complaints are outlined here:

https://mjtsai.com/blog/2017/10/14/the-impossible-dream-of-usb-c/

None of these USB-C “hubs” actually give you more USB-C ports.

There is supposedly news for 2019/2020 that suggests hub chips may be coming soon:

Update (2018-07-30): Accidental Tech Podcast reports on a rumor that next year Intel will finally ship the chip that’s needed for making a USB-C that adds additional type-C ports.

http://atp.fm/episodes/284 (19:10)

We've heard from an anonymous person that Intel is finally releasing a hub chip for USB-C next year. We may not see products based on it until 2020.


Also search a lot and only found one :

The Belkin 4-Port Mini USB-C Hub with Two USB-C

All four ports support only USB 3.0 speed (5 Gbps = 300 MB/sec effective).

However please note:

The USB-C 4-Port Mini Hub does not support pass-through charging and video output to monitor. This hub is only intended to use with USB-A and USB-C peripherals.

Update:

Found a 2nd one from Sitecom the CN-386:

Turn your USB-C port into 3 ultrafast USB-C ports and 1 USB-C Power Delivery Port

  • USB 3.1 Type-C input
  • 3 x USB 3.1 Type-C Output (10Gbps data and 7.5W power)
  • 1 x USB Type-C Power Delivery (100W power)
  • Supports USB SuperSpeed 10Gbps, downwards compatible with USB 3.0 / 2.0
  • Supports USB Battery Charging (BC) 1.2 up to 7.5W (5V / 1.5A)

One of the only shipping one-to-many USB-C hubs I've seen is in the LG UltraFine 5K Display, introduced by Apple alongside their USB-C / Thunderbolt 3 MacBook Pro in 2016.

A single Thunderbolt 3 cable (included) provides up to 85W of charging power to your MacBook Pro with Thunderbolt 3 (USB-C) ports. And three downstream USB-C ports (5 Gbps) offer additional connectivity and power to compatible devices and accessories.

This part is unique in that it is not a multi-port "dock" but a true one-to-many "hub".

It would be interesting to see if this part could be harvested from a damaged display and used independently.

four USB-C ports, one cable to the Mac