Yes, I agree.
I've suggested a few times over the years that they make the vehicles capable of their FARP/airfield actions independent, and make the mobile ATC vehicle an actual mobile ATC - even if it only gives range and bearing to a user defined approach point, range and bearing to vehicle and a cleared for visual when within some range. (though if you defined a touchdown point, and an approach vector, the ATC could calculate an inbound point for both players and AI...)
Then you could set up FOBs for both fixed and rotary wings on roads, and/or grass fields etc