What's wrong with hand cannons?
The number one problem with PVP is the aim assist on snipers. I've been saying this since TTK released.
They were absolutely fine before then. No idea why they changed it and won't change it back.
I think it's to stop asking for nerfs and actually get Bungie to do something positive for the crucible. Go back and watch Y1 clips - it was fast and chaotic. Every play style had a niche. These days, it's all about team shooting and chilling in the back.