@feld @saxnot As you said: it's not always DisplayLink which is bad, yes.
Then it needs to be a different protocol - I don't really care as long as it works and it's available for FOSS.
Currently, I'm using lenovo t490 -TB/USB-C-> TB3 doch -HDMI/DP-> 2 TFTs. An additional desktop is also connecting the other two DP/HDMI plugs. As long as the TFTs don't offer more DP inputs or multi-TB-USB-C in parallel, I rely on whatever connector they offer.