Why work for the Boeing Borg when you can make more money with less fuss elsewhere.
A lot of truths. Boeing does pay less than others. Their health benefits, though not as generous as before, is still top notch.
Yes their work as not as exciting as say Space-X, but the company is big enough that if the drone don't line one place, they can always transfer to other locations or other fields. Good drones can basically go where ever they want. East-coaster? There's Philly. Left coaster? Huntington and Long Beach (engineering only, not much production), Tree huggers? Washington's the place to be. Sun and desert? MESA has the AH-64. Hearland? T-7 is still in Missouri.
For internationals, it is probably easier to get into Boeing than other aerospace companies.