This gets confused all the time and I guess I can understand why. People confuse the stupid bullshit ibjjf rules and advantages and annoying points with this idea that dominant positions = stalling. Most competitors that are good at getting to ashi garami, the mount, the back, knee on belly, side control, north south, the crucifix, the front headlock, whatever the case may be, they often finish from those places. People don't go to the mount to or the back to stall out. They go there to finish. Maybe they don't get the finish, but people go to the 5050 to stall, or they may go to spider guard, or some other spots where it's easier to game the system for advantages and things like that. They sure as fuck don't take someone's back and then not try to finish.
Leandro Lo is really the only elite competitor I can think of that isn't known for finishing people. He'll get 40 points on someone and go for finishes but he just isn't great at sealing the deal. If tech falls were a thing in jiu jitsu then he would be the king of them.
The point system wasn't created for stalling. It happens that people use it for that sometimes, but the positions that give you points are great to finish from. Like the mount, back, knee on belly, and even many positions that you don't get points for, like the honey hole, ashi garami, and the crucifix.
Lastly, position over submission doesn't mean "a position that scores points". It just means your positioning for the sub you want needs to be good. It doesn't matter if you have closed guard, or spider web, or the truck, or a vice grip, or the over-unders with an anaconda body triangle. People like Sakuraba, Garry Tonon, Keenan Cornelius, and Nate Orchard show regularly that even a kimura grip is position before submission. People take the position before submission thing way too literally.