[Avodah] Tiqun Layl HaSeder vs. Tiqun Layl Shavuos

[rabbirichwolpoe at gmail.com]

Given we have a minhag to stay up all night Shavuos. And There are
reasons given - EG at Mattan Torah Bnei Yisrael were caught sleeping

OTOH we have maasim in the Haggadah and in Talmudic literature suggesting
staying up all night of the Seder until vassiqin! [Vkch hamarbeh... Harei
zeh m'shubach]

Wouldn't it seem obvious that we have a stronger imperiative to say up
all Seder night and be oseiq in
SYM, or 
Hilchos Pesach or 
Shir Hashirim - as the case may be - as opposed to Layl Shavuos which
seems to have a later origin?

KT
RRW
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