I do it if I’ll be away more than just couple of days. Some of my hardware is pretty old at this point and I’m just a little paranoid about the possible fire hazard. I’m sure it would be fine to leave everything running but no real harm in shutting it down either.
I think this time the manufacturers will be pretty quick at adopting the new branding; if there’s two competing devices next to each other, one marked with “USB 3.2 Gen 2x2”, which no one understands, and other one with “USB 20Gbps” I think the latter will sell more.