Previous versions of the Fairphone did have USB3, and also Displayport Alt Mode, so you could plug the phone into a display and use Android Desktop. There's more to a given version of USB than line rate.
I have a fairphone 5 and actively don't like it when it asks me if I want to mirror my screen when I plug it into a charging cable attached to a monitor.
I have a fairphone 5 and actively don't like it when it asks me if I want to mirror my screen when I plug it into a charging cable attached to a monitor.