SE must be drunk.

[Reynhart]

Now, let's talk about parry. Theories often don't line up with how it actually works. ~4% damage is increase is very false. This is already proven in the previous sentence. ~5.5% less damage doesn't make your tanking any better. Why? Because parry is very unreliable, you don't count it to proc to save your life.

I always felt that sentence very biased. Yes, you don't count on it to survive a tankbuster, but during the course of the fight, your HP will drop slower by having a high parry/block rate so, in the long run, you'll need less healing.
Of course, if your healer is trigger happy and wants to keep you at full health all the time...he's probably wasting a lot of MP

You said that Regen is enough to heal a parried hit, so it mean that a chain of parried hits could all be healed by some regen ticks, right ? If those hits were taken unmitigated, each of them woud have take a small part of your HP, and you'd have needed to pop a Cure for that. If parry/block rate would scale better, and parry/block strength would also be affected by Parry, it could decrease the need for healing significantly.