Adjusting Wave Boss Spawn Mechanics

[Malong]

Not a bad idea imo, but making a boss spawn only half the time greatly reduces loot chance and therefore drops in general (at least if the loot system makes any sense at all)

No. It depends if the boss spawn is capped to once in its designated three-wave cycle. If it isn't, within three waves, these are the probabilities:

12.5% no boss spawns
37.5% boss spawns once
37.5% boss spawns twice
12.5% boss spawns 3 times

And the expected value (and mean, since they're all weighted equally) is 1.5 spawns per 3 waves instead of 1 spawn per 3 waves, or 50% more bosses (over a long course of time).

If it's capped to once in its designated three-wave cycle, then it will be fewer (0 bosses 25% of the time, 1 boss 87.5% of the time) for an expected value of 0.875 spawns per 3 waves. I'm not spelling out the probabilities because I think this is trivial, even though the events are dependent.