Dear sir, you clearly do not know what you're talking about, and are mostly spouting nonsense. Please, just stop. Tank aggro isn't a problem, ìt will never be a problem as a result of crit luck, and as such, your whole point is moot. And even if it did work the way you want it to, your point would still be irrelevant. If you currently score a series of lucky crits, you would easily surpass the amount of DPS that you would (on average) put out with what I am suggesting. So actually, it's more likely for tanks to lose aggro with the current RNG element of crits being so impactful.
Crits/devs should ignore all mits? This is the point where is should be abundantly clear to everyone that we've left the bounds of credibility. Just stop.