Personally I see it as less a stall build and moreso a "Turn O. P. builds against themselves" build.
I can just imagine a Summon built with low Health and Speed, plenty of accuracy drops from ability and skill choice, and but so much Sheer Damage and Defence and perhaps even healup too as to have the strategy "Wait for the high roll while being invincible."
And, by how Confusion reads to my eye, seems it bypasses enemy Rs when triggered!
Now, a high HP high accuracy build would have no such worries... but it won't be cleaving through my Summons in a single connecting attack, nor basically irrelevancing any attempts I'd make at hurting it.