HDMI 2.0 and DisplayPort are both 60Hz, and there are several dongles that support have supported that for years. The CalDigit HDMI/DP dongles support multiple 4k monitors at 60Hz, so maybe the solution is just don't provide power pass-through. 30Hz is a dealbreaker in any product released after 2015.
I think you misunderstood. Yes, USB-C can carry 4K@60Hz. But it can't do that
and support USB-3 speeds, or gigabit ethernet speeds. So a dedicated dongle adapter to HDMI or DP is fine. But if you look at Caldigit's USB-C
dock, you'll see its video limitations are a bit more severe, and make for familiar reading to the StayGo specs:
"... resolutions including 4K UHD @ 30Hz, 2K QHD @ 30Hz & 60Hz, and Full HD 1080p @ 30Hz & 60Hz."
A bit more flexible when used with Windows (because of MST support):
"... up to two discrete 4K UHD displays @ 30Hz, 2K QHD displays @ 30Hz & 60Hz in extended mode, or a single 4K UHD display @ 60Hz"
Similarly if you get one of a number of USB-C monitors that now exist, you'll find if you read carefully that you can plug it in and have 4K@60Hz to the display (with PD), but the USB downstream ports on the back of the monitor would only work at USB-2 speeds if you do that. It's fine if all you're plugging into it is keyboard/mouse or receivers thereof, but not if you wanted to get good speeds from an SSD, for instance, or a USB-3 gigabit ethernet dongle. Or you can have that, but you have to drop the resolution and/or refresh rate.
No such limitations with Thunderbolt 3. I see Caldigit have a couple of TB3 Mini-Dock products now which would do
dual 4K@60Hz without any problems (as long as the computer's graphics were up to it). FWIW I have the now slightly obsolete Caldigit TS3 and it's great. (can't actually see what the difference is with the current TS3Plus, except the darker colour.)
(edit: there is no difference, I'd forgotten what i have is the TS3Plus. Not sure there ever
was a TS3 without the plus. Which makes me slightly nonplussed. They have added a "space grey"ish option.)
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Tell that to
Belkin USB-C to HDMI Adapter that is capable of 4K 60 Hz with HDR. With 10 Gbps bandwidth, Twelve South should have added HDMI 2.0 support with 4K 60 Hz.
It's just an adapter. 4K@60Hz goes down a USB-C cable, but not with USB-3 speeds as well, but that doesn't matter for a single purpose HDMI/DP adapter dongle. If a dock even allows it, it would have to downgrade the USB ports to USB-2 speeds. As do 4K USB-C monitors. Unless you stick to a lower resolution/refresh rate.