Another +1 from my side, see Introduce a new device_class for casement windows · home-assistant/architecture · Discussion #525 · GitHub
Already voted but I thought I’d add my $0.02, I’d really like it for contactors used to disconnect electrical equipment, which isn’t a switch because nothing is switched on or off, it’s just disconnecting electrical circuits.
I would like to a have a class for pumps.
+1 Not having gates seems a real miss.