I think this would be a nice change since void spike grenades kind of suck outside niche pvp plays, and lightning grenades were just nerfed. Also neither grenade has an exotic focused on them despite their poor performance. As is all 3 grenades are really only useful in pvp, so by letting YAS work with all 3 grenades it would help open them up for pve. Maybe even consider letting them work with the transcendence grenade as well.