I remember chaos accelerant with contraverse holds void build before lightfall dropped. I would have infinite mini super grenades and they were amazing for gms but that was with charged of light mods and they changed the mod system when lightfall dropped. Indeed the light did fall because with the new grenade mods I would struggle to upkeep my vortex nades and it felt out of the way to use the build.
Before Void 3.0, those charged vortex did more damage in addition to lasting longer and having a larger AOE. The change also coincided with a reduction in energy restored to Contraverse on hit. You used to be able to basically get the full grenade back if it ticked enough and/or you had enough charge mods in effect. I only put on my contraverse build for Festival of the Lost now, when I need to wear a mask and zone off the pumpkin head spawns.
Chaos Accelerant just is not worth using over void soul for most gameplay loops.