I was going to present from my phone to a projector the other day, but ( probably due the wear and tear of putting in the charger every day for several years) it was glitchy, so I asked if I could borrow a newer phone and got a few month old, still glitchy, so I had to use a PC anyway. The plan was that I was going to walk around with my phone during the presentation...

What I'm trying to say with this story is that for example monitor cable connectors are designed to fit tightly (vga and dmi even having screws) to give a constant signal, which you don't get from USB-C unless you stand still.