Carrousel7956
On my side, I was able to do 1440p using direct USB-C Displayport cable, and 1920x1200 using ugreen dock. Same dock is able to do 1440p using a laptop, so it's not a dock or cable issue. That's why I suspected Pixel 8 bandwidth also to be too limited for 1440p + audio + ethernet + 4 usb adapter.
gosuser7347
I don't face your issue with VLC, it works pretty well, sound is ok via displayport.
Overall I find Desktop mode very usable for basic task, like mail, signal & browsing. I found Vanadium adapt very well. But I agree with you it need more polish, AOSP keyboard bug, not possible to change wallpaper, and the mouse feeling is not so good so it give an impression of unresponsivness.