Naturally, that is simply a rough generalization of the scaling, and there are different weapons on each category that scale differently. (most notably daggers). However, those stats are usually the main ones for those weapon categories.
Out of all those stats, though, str is the one that gives the least amount of usage in combat. The best way to show it is to write down what each stat does (ignoring specific elemental boosts):
Skill outright helps people in landing their basic attacks/ignore evasion, and with a good enough skill, only then need to spend in one other stat, luck to reach a good hit chance. (Builds that need str, for comparison, are forced to spend in both). Also, pointing out the added skill pools, which always help.
Guile, I'll admit, would be the "2nd" least useful cmopared to the other two. Yet, it still has its niche- It helps in increasing one's crit damage for crit builds. Gives flank to increase one's hit when not in the front, and again, gives skill pool.
Now, looking into STR, the only in combat benefit it really gives is BW, which can allow someone to use heavy armor. I won't say that battle weight is useless- It can allow someone to use the heavier materials for their armor and weapon, and also lets someone use heavier weapon compoments, if needed.
That said, I do not think just BW is a good enough bonus for str, when compared to the other two:
1)There are talents that are here to help people in increasing their total BW, as well as lowering their weapon's BW. Using one of my characters, as an example, all I needed was 5 str points at most to both the armor with the material I wanted, and the gun. Of course, this can differ depending on what adjustments I'll make to the build, but the point stands.
2)When it comes to weapon compoments, most of them are either +power, +hit, or +crit. Naturally, though, investing into skill will at most of the times, give a lot more hit, and crit, than the weapon compoments.
I am not saying this is a bad thing- Weapon compoments should be that, compoments that help further boost one's build, and not be a replacement for stats. However, I hope this will help in showing that the usage of heavier weapon compoments, by themselves, aren't a strong enough reason to let STR stay as is.
3)While I spoke of the heavier materials and compoments, I should note that one can use the less heavy materials and compoments, and still generally good benefits for their weapons.
Thus, as it stands, str ends up mostly used for fire/cinder gimmicks, since the +fire damage is really the only bonus one can take advantage out of str, if they use str-based weapons.
So, with those points brought out, I would like to have a possible disccussion on how to buff str- Or at least, make the stat a bit more alluring for people.
I'll bring one option out for now:
STR granting HP: