I believe they intended them to have morters, and be more like support craft that would generally only be a little off the ground, making terrain far less of a factor.
But yeah, crazy loud thing that makes you a big target for an almost negligible benefit was a big downside.
Sigint talks about that if you call when you first see them. My favourite is when you call Sigint about the guard dogs. I think that story is legit too.
The Soviets tried to train dogs to run under German tanks with explosives strapped to them, making them literal anti-tank fur missiles. But when they made their debut in combat they ran to and detonated under Soviet tanks. When they were training the dogs they used Soviet tank hulls for practice. Soviet tanks used diesel fuel so that's the smell the dogs sought out. Then project was suddenly scrapped!
I found out about these when they appeared in MGS3. I also found out about the Fulton Lift system from MGS5. Both times I looked them up thinking they were fiction from a Japanese dude's head canon.
The fulton system is used in MGS3 too! The C-130 Snake jumps out of has the cable latching system on the nose. They don't show it in the game but he uses the balloon to exfil after Volgin nukes the joint