Imho depends. If you use heavier armor, I think it does not matter... if you use very light armor, it could be recognizeable.
Make a few tests with the Calculator Pack (http://infinitum.dyndns.org/crpg/calc.htm).
Btw... I had several chars with 0 wm (1H, pole). Without any wm (and no hybrid skilling) you would get 111 wpf at lvl 30. And that chars are very viable and playable. You need a lot of wm points to get a big difference in effective wpf. I prefer armored str chars, so for me it was more useful to get some if or one more ps.
The choosen weapon (higher base speed) or the player technique (e.g. turning into the swing) is imho more important.
Yeah, agi is pretty much underrated. I mean, 30/3 can be easily done. WPF is underrated. However, if they would buff it, there are points to where it simply becomes outspamming everyone.
Although that can be fair if you can 1-hit with 10 PS.