I don't believe I did miss your point.I agree that it is impressive, but you're missing my point. 7DMT will be an attraction that will be visually appealing from 360 degrees. They're building a mountain with a coaster that will weave in and out of it. It's not like they are just putting a ride with screens in a large building, which would obviously take far less time.
7D is a welcome D ticket that's using prefabricated track assembled onto a series of buildings itself, and set into preset areas in the dirt. It also has a dedicated, accessible access route from nearby backstage. And it's taking over two years to build what will be a nice, but not long family attraction. If anything TF3Ds ride system is far more advanced. Even if you can't see it. And would take far longer to install and finish if it weren't for the 24/7 schedule.