I use it for anything, gaming, web surfing, developing and sometimes even work (it does raise a few eyebrows when I take it out of the bag)
The big problem is the connection between nextdock and steamdeck: if I connect it directly via single usb-c cable I lose the ability to charge the steamdeck (the nextdock does not supply enough energy for keeping the steamdeck charged) and I also lose a lot of io (next dock as only one fullsize usb 3.0 port) so instead I use the steam-deck-dock and connect it to the nextdock with two cable (hdmi e usb) so that I can keep the steamdeck fully charged.
I would love to find an usb-c cable splitter so that I can have a device simultaneously connected to an usb-c pd charger and a second connection only for usb data, there are some but none of them support usb alt mode necessary to use external screen.