I’m too tired to do the math but my kneejerk takeaway reading that and my meh statistical knowledge says I’m still better off, were I an evoker wanting to maximize my chances, at 3 dice rolls compared to 1 slightly better odds roll.
It reminds me of horrific visions back in BfA. You got the best reward for 5 mask runs and any subsequent run gave you a decaying value item drop. So if you did a 5 mask run and then another 5 mask run, you got the 5 mask run drop and the 4 mask run drop.
However if you was a fresher alt, it may have worked to your advantage to do the mask runs in ascending order because your gear may not have been able to handle a 5 mask run but getting the lower tier drops in hand may have pushed you to the point where you could do your harder mask runs. It was still, on paper, the same reward values for the same runs but it could lead to totally different results.
Ah well. I’m not playing an evoker as a main or serious alt, so it doesn’t affect me. Just seems like a weird design decision.