The significance of IVs was eliminated with the gym update. It mattered a lot for the big 7 as you would get higher CP and better placement. It mattered for prestigers because you had to get just the right CP to max prestige per battle. And while I didn't dabble in it, it mattered for bubble straters too.
But then gyms were ruined. And then ruined even more recently as the decay rate was increased for some stupid reason. Apparently the community just wants every gym to be an assortment of punching bags that you can beat without even looking at the screen. Who out there likes this? Nobody in my area that's for sure, everyone I've chatted with at raids has concluded that gyms are pointless. We want out turf war game back.
So what are IV's good for now? Well, a high attack IV may let you do 5% more damage to a raid boss until your mon faints. Big whoop. For raids, what matters is: # of people > high level mons w/type advantage > movesets > lag >>>>>>> IVs.