FFXI did this, clumped all multi hit dmg into one number, but you were unable to tell how many hits actually landed (without looking at tp returned), which crit etc...

There's always the combat log if you absolutely need to know the damage, otherwise you should know how many hits your WS is, and you should be able to easily see one of the numbers clearly, like if it was around 200 or 300. That gives you a general idea if it's hard to see the numbers.

Personally I like how it is right now, but it's such a non-issue that I could care less.