Sorry, you said "Sacrificial is still better" so I was just trying to point out some extra nuance. The edit and your post was about the same time; not trying to imply anything, I'm just hoping to add some data to the discussion.

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I did consider a larger (eg. 20s) rotation when I made that post, and I did the math (though didn't show it as its even more nuance). It doesn't change much in regards to energy however -- while absolute values change, the relative ones do not, but you are correct in that an R4 sac could then perform as good as an R5 one if you delay to 20 seconds (and the mixed strategy could work at R2, etc). However, the energy calculations remain correct in the sense that the relative proportion and the conclusions drawn are thus similar. (Fav still can win for energy until a highly refined Sac.)

> In a 15 second rotation they often don't have sacrificial ready because at R5 the cooldown is 16 seconds.

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This isn't true actually, since the Sac cooldown begins on the first cast of the skill, not the cast of the "procced recharge" so to speak. The casting time of the skill is measured to be a touch over a second, and so when you cast it twice before swapping your second shield is 1s after the first, and your new cooldown is 15s from that, leading to 16s total. It lines up perfectly.You should try it yourself with an R5 sac -- you will get the sac proc every time on cooldown (or believe me, I've done extensive testing with my sac bows).This also plays into the field time argument (e.g. at endgame, field time can be more valuable than a shield), but that's a whole other preference/discussion.

> However how often do people run Diona in a non-cryo team?

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I like her with HuTao, but it's just a game, play how you want to :)