While we're at this... I've been wondering...
What's the defense cap thing all about? Is it just about being uncritable? I've been looking at wowwiki, which I know has many things outdated but this part is probably mostly correct. And the net avoidance ratings from defense when paired up against bonuses from dodge, parry, block and resil seems to actually be superior even after reaching uncritable.
I guess explaining it doesn't show properly what I mean... I'll just show numbers then...
25 defense skill = 1% dodge + 1% miss + 1% parry + 1% block + 1% less chance to be crit.
25 defense skill = 4.92*25 def rating = 125 def rating.
For sake of making things "more alike" I'll count miss as dodge. So to get that avoidance without def it's...
2% dodge = 78.7 dodge rating
1% parry = 49.18 parry rating
1% block = 16.39 block rating
1% of crit reduction = 82 resil
After you already get crits out your 125 def will still amount 127.88 rating points of dodge+parry, and you get the block rating bonus on top of that. So for avoidance purposes def still outperforms the others unless you don't count block at all and decide to compare it with pure dodge rating.
540 defense r = 4.4% miss/dodge/parry/block and crit reduction .
If you want to push your avoidance higher, why use anything other than more defense?
And when do you decide you have enough avoidance? If the only objective was uncritability it would be easier to reach with resil.