In general, NEMA 6-xx is going the way of the dodo. More and more we’re selling 14-xx where we used to sell 6-xx. I think this is a consequence of the general trend towards more “smarter” appliances, welders, etc. where the electronics are powered (inside the appliance) by commonly available 120V power supplies - which when applied to a 240V main function, requires a neutral. Hence 14-xx instead of 6-xx.
Other plug and cord connected loads we see occasionally:
Ovens and cooktops that aren’t combined in a range.
High end hobbyist shop equipment: CNC machines (routers, mills), table saws, band saws, jointers, planers, etc.
Perhaps, for dedicated loads, a menu for configuration (Amps, Volts) and another one for purpose (range, welder, dryer, etc.)