Not just Linux users. My wife got a Satechi On-the-Go USB-C hub for her MacBook. Satechi sells itself as a premium brand for Mac accessories. However, when the advertised 4k@60Hz support did not work, their support suggested that we update the firmware. They could only provide firmware updater for Windows. Unfortunately, even on Windows the firmware update would not work, spitting out completely uninformative error messages.
In hindsight, I found out that Satechi is now largely reselling cheap Chinese reference designs that can be had from AliExpress from 10-30 Euro/USD, repackaged in different casing [1]. Since they don't actually seem to control the firmware, they are just reshipping half-working Realtek firmware update utilities.
Oof. That'd be an RTM for me--product not fit for purpose.
At least with Toshiba/Dynabook, it's vaguely possible for a techie to pull apart their firmware update process & hack something together that doesn't require Windows any more...
https://robots.org.uk/ToshibaX30X40FirmwareUpdate