Maybe they mean keeping thier mp low and letting parsimony to last longer to get that 8 mab

I rather use SCH neck and use Immanence like you said, i am even able to get off a stone V > Alacrity, Immanence, Ebullience > aero V. padding that much into detonation is amazaing. course it strains my charges but I do not MB when I sc like that, well sometimes, free cast aero III.