I'm not sure you're really paying much attention to the numbers, though. The block meta's damage reduction needs 3 unblocked hits to really fall behind. It's massively larger.
It doesn't 'only matter if you block 5 hits'--it's nearly 3 times larger when you block 5 hits. It already matters once you block 1. Furthermore, 1 Critical Block with the Block meta is worth the damage reduction from the Armor on almost 4 unblocked swings.
Your vulnerable point is not just the unblocked hits. Your vulnerable point is all of the hits between when you were full and when you got topped up again. Your healing was negligible during that period, and the Blocks saved your life. As such, you are already relying on the Blocks so save your life, so I fail to see why you are adverse against bigger Blocks with a higher chance of saving your life.
Honestly, the chance of the Armor meta saving your life is much, much lower than the Block meta doing the same thing.
If you have as much Mastery as most high-end Warriors, your Block and Avoidance rate is more than high enough to make the Block meta much, much greater a source of damage reduction, and reliable enough given the magnitude of reduction to be worthwhile. 77% of your melee damage taken is while Blocking, after all.
At this point, it kinda sound like you are ignoring the numbers and just sticking with the Armor meta out of habit. The Block meta is almost certainly going to have a higher chance of preventing deaths than the Armor meta with high-end gear. (e.g. 99%+ of the time, given the odds of only 0.2% of you getting 3 unmodified melee swings in a row)
A good practical example is simply your first result on the death browser on WoL.
From when you went from full to dead over a period of time. During this time, you Blocked or Avoided every incoming attack, yet you still died. It's not just unblocked hits that will kill you--the fact that 77% of your incoming melee damage is Blocked makes this highly unlikely.[20:26:33.711] Sinestra Wrack Booi 12302 (R: 9112)
[20:26:34.781] Sinestra hits Booi 43021 (B: 64532)
[20:26:35.748] Sinestra Wrack Booi 21528 (R: 10252)
[20:26:36.548] Sinestra hits Booi Parry
[20:26:38.407] Sinestra hits Booi 34029 (A: 3632, B: 56492)
[20:26:40.191] Sinestra hits Booi 861 (A: 42688, B: 65324)
[20:26:41.990] Sinestra hits Booi Dodge
[20:26:43.782] Sinestra hits Booi 67559 (A: 2114, B: 29860)
[20:26:44.464] Sinestra Flame Breath Booi 68406 (O: 6812, R: 20894)
[20:26:44.746] Booi dies
In this example, the Block meta would have possibly saved your life. You died to 6812 overkill. The Block meta would have most likely shaved off enough damage for you to survive the Flame Breath that killed you (would have reduced about 7.3k, minus the Armor value--and you'd get some extra spill-over from that big absorb as you would have taken no damage that swing.)