the megavore capstone is a really useful skill. i’d recommend it for any Fl4k build. it helps with mobbing when you don’t have time to aim or when it’s hard to find an enemy’s crit spot, (rampager). also with a double penetrating alchemist (or any torgue gun with sticky) the stickies can score a crit even when you didn’t hit a crit spot, while replenishing your transformer, in higher mayhem levels the electric self inflicted dmg is less note worthy but still good dmg on sticky explosion. Megavore isn’t necessary, but it is definitely my favorite capstone for Fl4k.

edit: to explain a little better, my build is very crit dmg heavy. benefiting from that as much as possible is the best thing possible for my build, so much so that I can run loaded dice as my normal artifact and still hold my own in M4. definitely a glass cannon but running around and jumping right into the middle of the fight is my style. and i have good survivability for having low health, and only lvl 50 transformer shields.