The modern Apache fires its weapons from so far away there is no hope of hitting it with a machine gun. Those things are probably the most high tech the Army has, it can communicate with a drone miles ahead of it, that will transmit back the location of a vehicle and the Apache can destroy it without even having line of sight.
Drones - limited arms. Though they may be the future when they beef them up a bit.
Apaches - the enemy machine guns them. Not protected enough.
Here's a story from 2007 when the high end B1 screwed up, the Apaches were challenged and the A-10 helped save things:
https://medium.com/war-is-boring/a-10s-saved-the-day-in-botc...