I don't advise that ^ even in the SA vids they show a straight line to the jump unless your spinning. I'm not sure which vid your referring to but the intro to jumping and intermediate jumping both show this straight line/flat base. Jumping with Jussi vids say the same thing and experience tells me this is 100% right. If you always levae the lip off your toe edge some tricks will be really hard for you imagine.
You have to practice toe side and heel side. The setup carve really helps to control speed and you can boost out of a carve too if you need the extra oomf to clear.
Not sure but I seem to recall those jumps that he is hitting straight and flat basing were really small, but maybe he was doing it on the big ones too.
Flat basing without turning into a jump is just asking for it imo
disclaimer: I'm an old learner, not a young expert.
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