We've already covered the fact that damage numbers alone don't tell the tale properly. Yes, perhaps it can help in determining a more effective burst rotation, but that's already entirely possible on a dummy, or through duels. Practical experience. Not numbers in a vacuum.

Damage to PvE objectives - and let's not be coy - ice is circumvented by the ability to have it reset. I could let someone deal 99% of the damage it takes to break a small ice, then take them out, let it reset, then put in that last 1% and the ice is mine. All their damage amounts to 0, points wise.

I'm really not trying to say damage meters aren't good, but I am saying they're largely unnecessary for becoming better, especially in a form of content that isn't static.