I have seen a number of questions already regarding how the optimizer handles hit rating in classic.
TLDR: If the optimizer doesn’t take you to the hit cap, that’s ok! Mr. Robot is aware of all the math and did it on purpose.
Here are all the ways your attacks can do nothing in WoW Classic:
Against a level 63 mob (raid boss)
8.6% chance to miss with special or “yellow” attacks like bloodthirst, backstab, etc.
8.6% chance to miss with melee auto (and auto shots) “white” attacks when not dual wielding
26.88% chance to miss with melee auto “white” attacks when dual wielding
6.5% chance that physical attacks will be dodged
14% chance that physical attacks will be parried when attacking from the front
5% chance that physical attacks will be blocked when attacking from the front
16% chance to miss with spells
The first 1% of hit on your gear is ignored against raid bosses if the boss is 10 defense skill above your weapon skill.
Weapon Skill essentially gives you a chance to hit as well as reduces the boss’s chance to dodge
Raid bosses have 315 defense
To calculate chance to miss, you use the formula:
Your Weapon skill - Target Defense = D
Miss Chance = (5.6-IF(D<-10,(D+10)*0.4-1,D*0.1))/100
With 300 weapon skill, miss is 8.6%
With 305 weapon skill, miss is 6.6%
With 310 weapon skill, miss is 6.1%
With 315 weapon skill, miss is 5.6%
Dual Wield miss penalty is
Miss * 0.8 + 0.2
With 300 weapon skill, miss is 26.88%
With 305 weapon skill, miss is 25.28%
With 310 weapon skill, miss is 24.88%
With 315 weapon skill, miss is 24.48%
**There is a “thing” where warriors’ off-hand will use the “yellow” hit chance while a heroic strike is queued up.
Boss’s chance to dodge you is:
Dodge Chance = (5+(Boss Level*5-Weapon Skill)*0.1)/100
With 300 weapon skill, dodge is 6.5%
With 305 weapon skill, dodge is 6.0%
With 310 weapon skill, dodge is 5.5%
With 315 weapon skill, dodge is 5.0%
As an example, if you are a dual-wield fury warrior with 305 weapon skill and 5% hit on your gear:
Miss Chance = 6.6% - 5% + 1% = 2.6%
Dodge Chance = 6.0%
So, your Bloodthirst will be avoided 6.0 + 2.6 = 8.6% of the time. Getting 3% more hit on your gear so that you are “capped” would still leave you having 6% of your Bloodthirsts avoided by the boss.
There is nothing magical about the hit cap in classic! You’re still going to be unlucky sometimes and have your attacks avoided. Our advice is to not stress out about a couple % of hit rating and trust in the math.