Or just drop in real high and make the appropriate speed checks.
It's not necessarily about making the exact same speed checks but knowing your board/speed/feel well enough to make the *right* speed checks and a good setup turn on to the lip, no matter where you drop from. Same result
You do have a point but like you said it's limited to one jump and that's it, after which you need to worry about speed checking.
The drop zone is a good starter tool and that's why the "watch where others drop and follow their line" method is always preached to beginners in the park. It is easy to emulate, and it works for the most part.
But after you get good at that, the next step in your progression is to be able to gauge your speed and check as circumstances dictate (which as the tape shows, is not advice that I followed...)