PoE Orb, Blight builds with custom stat filters

Hey there! Rolled a Phantasmal creamtion necromancer and i have been loving farming blight ravaged maps and simulacrums for a few weeks. However after browsing POE ninja for inspiration i noticed that there is a ton of different variations of combinations of support gems people link with Phantasmal cremation. That made me wonder, what is the point of supporting cremation, as i assume most of its damage comes from the corps explosions? and what are the most "meta" combinations of support to use with cremation, not using original sin? Also, do the corps explosions from creamtion count as hi