I know a few people who took the spoilers off their bindings and they swear by it.
They say it gives a surf/skate feeling to the ride.
I'm gonna give it a try this winter.
Have you ever tried it?
Pretty much all bindings can be ridden without highbacks. But for some the boot-heel cup fit is not great without the highback. That is why some (NOW, Switchback) over little 'no-back' inserts to compensate for that.