Dim Shield was already nerfed, pretty recently too. Namely, when the 75 quanta cap was added. That didn't *directly* change the shield, but it absolutely crippled its synergy with bolts. Before then, the shield was a lot more annoying, now the shield is not too annoying. It forces you to pack PC when you visit the arena... but that's not a bad thing, it would be silly if a pure rush could beat everything.