The problem with large parachute drops, especially post-World War II, is that you need to be able to get a bunch of large transport planes to the DZ. However, if you are able to do that, chances are you won’t need to do something as risky as a parachute landing anyway.

Then you run into the issue of whether or not the resources spent on guarding the paradrop are worth it or not. There’s a reason why large operational/strategic paradrops are more in the theoretical than real. However, even theoretical offers an advantage. The force in being strategy means that a defender must prepare for the possibility that a paradrop could happen.