Please, just stop thinking like Stats 1 > Stats 2 > Stats 3
Crit is for sure the worst stats when looking at mitigation perspective, even giving us more rage when playing FR + Ultimatum.
Haste give us more rage, DPS and Shield Block uptime. The more rage we have, the easier and less punitive is the playstyle. Considering that with about 29%, sppecd Heavy Repercussions, we can keep 100% Uptime on Shield Block, I would say it's the Haste CAP. But we must keep in mind, that LESS THAN 40% of our Rage comes from rotation, and on Heavy Tank fights, it will drop even lower, some ppl said that would be even lower than 20%. So, progression contents will make Haste worth less.
Versa and Mastery increase our IP, but with today's changes (Vegeance and Rage Gen nerd) I would expect to be casting about 30 ~35% less IPs,we must track this.
Versa reduces Overall Dmg Intake, and Mastery increase our Critical Block, increasing Scales of Earth uptime (Bonus armor passive).
Looking at EN Gear Drops:
We can see a dominace of Haste/Mastery Gear, and this can't be avoid.
So, as Mythic content tank, I will gear myself trying to keep Haste at MAXIMUM cap of 28~29%, never more than this. And get all the Versa Gear not including Crit. All the mastery that comes, giving I'm keep haste at cap and priotizing Versa, will be welcome.