it would make sence to have the option of a wired conenction/displayport.
theres a reason Virtual Desktop is popular.
whats not clear is if the wifi dongle is a special video wifi optimised connection or if its just for standard wifi.
it sounds a bit silly to me to not have wifi built in by default. give expected use case(s)
Dedicated Wifi dongle makes sense. Easier to support than random routers who all behave differently.