I think full-blade is a misleading term because it masks the real problem. Most skaters that jump with the technique commonly labeled as "full-blade" have, in fact, a pre-rotation problem. But even their blades leave the ice eventually. I don‘t think it‘s actually possible to put your entire blade on the ice during a toe jump - you‘d splat on your face.
There are those that come pretty close, prime example being Morisi Kvitelashvili for the men.
Watch his replay starting at 4:02 in slow-mo - his 4T and 4S look identical, even the commentator notes it. This
is a full-blade, to the degree that I‘d say he literally jumps a 4S twice and shouldn’t get credit for the second one.
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Maiia, btw, not Anna, would come closest to this kind of technique on all of her toe jumps (which is, imo, the reason they’re somewhat unstable and she sometimes misses the pick and gets completely off-axis in the air). But even her blade isn‘t completely on the ice, so not full-blade.
https://m.youtube.com/watch?v=lcrnkALZHws
Minute 5:00 shows it pretty well.
Conclusion from all of this? It‘s not the "full-blade take-off", that‘s the actual problem but the amount of pre-rotation.
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Look at this 3F in slow-motion at 7:55 and take in the amount she rotates while her pick is still in the ice. It’s true that, right now there’s no incentive in the current rule book to punish her for it. But my question: is it fair? There‘s a reason why, when you finish your rotation on the ice during landing, your jump gets called underrotated and BV deducted. So, why wouldn‘t it be the same during take-off?
I think that‘s actually what should be looked at, for Anna‘s jumps but for everyone else‘s as well. Does it make jumping 4Lz and 4F and whatnot easier? Then, yes, absolutely, create a rule that enforces loss of BV for excessive pre-rotation. At the moment, though, the judges don‘t care, so the coaches and skaters won‘t either.