When is too crazy over the line?

[Sportster-2001-951C-Stock]

one question I'd like to know... is it that important to ensure that you turn off the throttle when you get "air"? I've heard the engines can over-rev in the air and its not good to be suddenly slowed down...

I see this as being the biggest issue with a supercharged 4tec... compression stroke and the charger itself, but I don't really recall if its necessary with the older 2 stroke rotax

isn't the MPEM rev-limiting the engine anyhow? (I mean will the coil fire higher than 6500/6800 rpm?)

also I don't ever recall people doing this on the older Seadoo PWCs themselves

You can get airborne unexpectedly, and it happens quickly, so doubt you have time to throttle down. There's a rev limit programmed into the ignition to avoid damage but keep in mind revving a worn engine high can push it over the edge.

The 4-tec has a clutch on the SC to avoid building too much cylinder pressure during high revving, it's probably necessary?