I think a lot of people view IF vs WM in a duel server type of situation, ie "If only I had hit him sooner". Honestly, when was the last time you actually said or thought that on a battle server? If you want to hit someone sooner, get a faster weapon.
You can't ignore ranged and cav, which are just as integral to the shitty battle experience as melee combat. You can't block arrows unless you have a shield. You can't block cav bump damage at all.
In those instances, in which you lose 50% or more of your health from an arrow or bolt before you even get into melee range of the opposing team, or when you die to a cav bump, do you think...
"I wish I had more WM"
or do you think...
"I wish I had more IF"
I know that whenever I get shot by a ranged projectile or hit by cav charge damage, I don't think "I wish I had more WM".
I think "I'm glad I have 10 IF".