On the plus side Teams is a really well put together VTC setup, and infinitely more user friendly then the previous GC setups, so once you get it working that bit is really straightforward.
With the VPN setup, all the data is encrypted between the laptop and the network, so doesn't really matter if the wifi is encrypted at all, but agree it is easier to keep a secure wifi network then ever. Not needing to use a network cable is a really big deal though, as most hotels don't have drops anyway, so was a bit useless for traveling or working outside an already established office previously with the old no-wifi laptops.
Other departments have already shifted to wifi in the office ages ago (on a trusted network that doesn't need a VPN to connect) but no idea if we've taken that leap yet.