I have to inform you that pure STR builds are FAR from useless, compared to pure AGI builds.
i didn't say STR builds are useless. i just say aren't that EASYMODE you stated. because a pure 36/3str build is an easy prey against multiple enemies while a balanced build can still take some hits while retaining enough mobility to react. pure STR will only shine on really tight brawls AND with support. balanced or agi oriented builds can move freely on flanks, engage/disengage at will, chase down archers. STR builds just engage and fight till is over since they can't chase, can't retreat, can't kite or freely exchange targets. all features that packed together overcome easly the lack of health points and damage.
now, i did some serious maul work 2 months ago... while retiring the greatmaul i tried various builds. 27/12 was somewhat good, lot of onehits with 47 blunt and 9PS... but 4ath was not enough to chase who try to get space... at least while wearing decent armor plus the 8.5 kgs of the maul. 20/21 was not bad, opponents with less than 7ath couldn't ran faster enough to kite or retreat but 6PS sometimes is not enough to crush other maulers /heavy polearms/shields. the one i had the best results was 21/18 because opponents can't escape your overhead. they're forced to fight at maul reach (and often die).
i still say agility path need some love. is not too bad but neither equally balanced. if weapon profiency could be worth the WM points. we'll see less STR build spam. if armor wpf penalty become more emphasized, we'll see less STR build spam.
all this to say that yes, balance between STR and AGI could get a improvement but is not total crap or pure STR = easymode as you said.