True, but you now have the Humvee and others which are armored, but they cannot be transported by the Osprey which the Phantom Badger was designed for without the armor that would make it too heavy for the Osprey. It is not supposed to be an either or situation.
In WWII terms it is the difference between a White Armored Car towing a howitzer versus a Willys peep towing a pack howitzer off of a glider.
You mentioned gliders which were discontinued in the 50’s when the 82nd’s 325 Abn inf Regt was still a glider outfit. Since then there have been many applications where gliders could have been used instead of sending in the much more expensive, and maintainence intensive choppers. Were they a casualty of the rotary wing war ?