What can be seen can be killed.
Not if all the enemy has is small arms. More to the point, if your aircraft are to be used to attack the enemy, if it is a drone, the only thing of importance is that the enemy fire is ineffective; if it is not for that purpose, then just being able to avoid enemy fires is enough.
While the USAF has consistently prepared for a fight with a technologically advanced military since the end of WWII, the truth is that unless our enemy is sponsored by a technologically capable power, such as in Vietnam, everyone we have conflicted with are low technology, usually in unconventional warfare.
For this we need high endurance, low maintenance, and low cost aircraft.