its probably because of pve bringing it down, i think thats just what class people had equipped.

Doesn't surprise me at all. For every Voidwalker I see in Crucible, I see 2 more Sunsingers usually. Personally, for me, I find it easier to get straight up kills with Nova Bombs as it's easier to challenge people with an instakill, but I find many more interesting situations with Radiance and usually find more opportunities to use it since it's not an attack and more of a heightened state of effectiveness allowing you to generally net a good amount of kills. Sometimes, I only get one or two kills, but I have FAR more control over a high pressure situation when dealing with more than a single player. Granted, I don't just self Rez all the time, I use Radiant Skin and directly challenge my opponents head on. Still flinging those nova bombs is mad fun, and I love making people go boom with bloom. Lol