[Imp]

Area SAMs maybe not targeting UAVs spotters but have the option guessing game to switch off.
If the UAV survives an attack from the likes of a patriot so it takes more than one missile theres a good chance the plane would have to if you transfered the die rolls to it so no real effect on the game. If it shot it down with the first missile the saved your less effective AA letting off multiple shots to down it.
Small games its a problem as limited AA assets but bigger games its a guessing game what reloads etc can the manpads hold things off while I do esp if helos are about to.

Needs thought to work on what does shoot at them modern Russia has a whole range of unit types for instance while British has 3 including manpads.
If you said Rapiers dont fire that leaves manpads & stormer only to engage it but go back to the 80s & now its just manpads.
What I am trying to say is its a game & some OOBs would be far better off dealing with UAVs than others if it was done on class, realise you were asking for a switch to choose.