Interesting article Gunnarr!
The interesting part is that weapon DPS affects the special attacks. So, if a Greatweapon has DPS 40 and 46 from 230 strength*, and a similar level 1-hander has DPS 28 and 42 from 210 strength*, they effectively become 129 and 105 plus the ability damage (minus armour and toughness).
Indeed, Greatweapon comparable effectiveness is getting lower with high strength. Greatweapons still provide a greater burst, and I believe they are way more efficient in a fluid situation. However, is that better than offsetting the survivability of sword and board? *HOWEVER* I am *very* confident that in a multi-tank situation where there is a "main-tank" that recieves the main-pounding, it is most likely way more efficient for the *group* survivability to have the other tanks use Greatweapons for the extra damageoutput (and thus the opponent croaking faster, which means less damage recieved for its target(s)).
*These numbers are for my WP in the above screenshots when Sigmars Fist is in effect