I have managed a couple of foiling landings and both were smooth and in control. I suspect like anything it's a matter of practice until your body learns how to do it.
In the meantime, touchdown landings are pretty nice and not that hard to do. Even parachute landings to water start are pretty good when you're zooming around on a 5m kite and everybody else is slogging around with 12m and TT or surfboard.
Possibly the nicest part is the sound the foil makes when you load up and boost off a wave. The sound ramps up as you accelerate then you get a very satisfying "swooooop!!!!!!" as the foil cuts loose.
As to why would you? Why not? Jumping is far easier than most of the other foil moves (tacking, 360, flying foot swaps). It still requires a fair amount of technique to get it right. It's fairly forgiving of errors. Even a bum splash landing is good and there's huge scope for improvement.
It's just fun, and there's a degree of surrealism in the fact that you're jumping with a ginormous foil hanging off your board. Almost every part of foiling has a "did that just happen" moment. It's a bit like when we started kiting and people would stop to see what this impossible thing was.
In comparison to other things people do with kites and boards: Handlepass? Rolls and spins? Board offs? Why would you want to do any of that stuff?
Here's a video of some foil freestyle I just found: