Coming back to the aerodynamics argument: Why spend more energy than you have to, to achieve a task?
Yes, we have bullshit tech but we're also no longer in a big primary war with a primary opponent. We're seeing the damaging effects of big super weapons and over-powered equipment, so we're preferring on a political level to have lots of equipment that's "good enough" that can grow over time rather than super-weapons which become hopelessly heavy handed in scenarios where precision is required.
Cheating aerodynamics means lots of problems.
You spend more energy than you have to, to move through the air. You're heavier, so you need to spend even more. It also means you're more sophisticated, so there's more inside your body to go wrong with you, that you'll fall into disrepair and need more maintenance, get sick more often and be more temperamental. Worse, all the screaming you have to do to lift yourself makes you louder, so you're heard from a huge distance away and all that wasted energy means you either can't loiter (a critical function of close air support) as long or you use an expensive powerplant making you both a high value target and a big risk since your powerplant if it goes up could result in big scary collateral.
As an animal, what we're looking at here is a swan with no head and the legs and arms of a kangaroo. She can soar and use her legs like air-breaks for very tight turns or tuck her legs back, spread her wings and fly very slowly with huge stability with no specialist gravity systems -- meaning she looks like a conventional weapon so less emphasis is placed on knocking her out of the air by the enemy because she's under-estimated: It also makes her a lot harder to identify from a distance using sensors.
Even better? If you do suffer a nasty nasty hit, you can just glide back down and not roll and smash into the ground and skid-row into pieces across a plateau, sparks, fire and smoke: You can just approach tenderly, come in at your own rate and do your best to use what altitude you can to make sure wherever you plant your feet is good to you.
Edit:
Reading this post back, my technophilia is pretty obvious lol