[lern_too_spel]

> If so, this is not terribly important

It is not uniformly random, which is the whole point.

> That article is mostly about speed

The article is about how to actually achieve uniform random at high speed. Just doing mod is faster but does not satisfy the uniform random requirement.

[np_tedious]

If your number of AB testing combos cohorts is fewer then 100 then yeah this passes for being uniform

[lern_too_spel]

It doesn't, mathematically. It might be good enough for some cases, but it is not good enough for cases that actually require uniformity.