Why doesn't Ramattra's Vortex go all the way up?

So I don’t understand something when it comes to Ramattra and his vortex. Why doesn’t it go super high up? it acts more like a trap then what the trailer made it out to be?

I figured it was gonna be a ability that stops flyers? Like Phara and mercy combos for example. Lets also be honest, flyers are really hard to hit and deal with. They go really high up to the point where his vortex doesn’t even reach half way to their highest point they can get and they have a lot of mobility, especially if you add a Juno or Lucio to the mix.

So is there a reason, I am just curious. Seems a little like a poor use of what the ability could be.