Hillarity.

[zosia]

There are no retrictions even remotely similar to how bad gating Diadem to 1 ilvl 210 piece of gear per week would be. Because 1 ilvl 210 piece per week with the RNG in Diadem does not equal weeks or even months of grind, it equals years of grind.

Of course it depends on the effective chance of obtaining a good, ilvl 210 piece of gear that qualifies as BiS. If the cumulative effect of all the RNG, and rolling on gear leaves you with more than a 1% chance of getting something good each time, I will be quite surprised.

Don't need to make diadem drop a single piece of 210 per run, SE could just make it a personal lockout where you can only win one 210 per week.