I guess that is my queue to say hello 
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My standing is that a warlock (or caster in general) shouldn’t be going for crit before getting a good hit% basis. Which I would estimate at around 10%. Since my guildie doesn’t currently have that I was pushing to get him to get more hit gear and that’s where our discussion began. I am not sure how much aware you are of my guildie’s current gear but we are not talking 14% vs 13% hit while it getting replaced by some crit here. We are talking about having 5% hit and your tool prioritizing gear with crit over gear with hit. I am not that familiar with Askmrrobot’s tool (and for sure don’t plan to pay for it just for this argument xD) or the calculations behind it. I personally use an excel sheet from the warlock discord, made by Zephan. When I compare both options on my guildie’s current gear setup, bloodvine chest would lead to a 7 dps increase (no world buffs but with raid buffs) and nemesis robes would lead to a 4 dps increase (so 3 dps less than bloodvine) I suspect it might have to do with the valuation of crit and or hit in your tool and that they have the same value for sp/dps output no matter the current hit/crit value. Either way I wonder what causes this difference between these tools.
Kind regards 