[Kameron8]

Upkeeping enough Voidgates to make 1 projectile attacks a serious, one-shot-kill level threat is fairly hard to do. Once you've gone beyond ~8 gates, you're not going to be able to feasibly maintain your setup before they start to disappear from duration. Tile destruction, while not overly common, completely decimates the small formations that allow optimized projectile spam.

Because of all that, I think it's not overly necessary to implement a gate cap -- there's already a soft cap because of their duration. Nor does any RNG failure rate seem like solution anybody would want to deal with. The only things that need to be addressed, in my opinion, are:

1. Black bolt's lack of a cooldown (The infinite gate setup time button)
2. Multi-hit projectiles with gates (Specters, Acid Flower, Forked Shinken, and, arguably most importantly, Fray projectiles)