In my opinion, no.  She was just trying to redeem herself, no one really liked her at the time and she wanted to play the hero.  She had Equ build Aradiabot, not for the reaction of “Yay Araida has a physical form again!” but hoping for the reaction “Wow look what Vriska did, she’s amazing”

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A Sylph heals and Life well is life so a Sylph of Life would probably be the most amazing Healer second only to a Muse of the same aspect.  They potential would have the ability to extend their lifespan indefinitely and heal any wounds they receive making a master of these powers effectively immortal.

Yes but it goes so much deeper than that.

Faq

Probably

It’s a psychic power wielded by Purple bloods to keep lowbloods in check.

What exactly it is is unknown.  Gamzee and Kurloz have been seen using different types of chuckle voodoo so what specifically the power does might be different for every user.

The requirement would be at least once before entering for a successful session.

As for a limit, there hasn’t been once mentioned and no one’s tried to prototype more than twice.

Yes.