There seemed to be a lot of confusion as to the value of STR vs MND, since STR has stand-alone benefits, and both are 20% mods.
((( Disclaimer: I made this spreadsheet superfast, so please chime in if I'm mistaken! )))
Similar to DEX being beneficial only in a certain (and hard-to-predict) range, one of STR's benefits (fSTR) actually has this same "problem" -- beyond the min/max values of fSTR, it won't do anything. It used to be a pretty safe assumption that WHM will be within this range (uncapped). However, with cruor buffs, martellostuff, and atmas like Stout Arm (anyone using that?), Abyssea could put your WS set over the cap.
The image below makes a few assumptions, then moves along the range of fSTR showing the benefit of STR inside and outside that range. The assumptions are:
DMG:54 weapon, ATT=500; mob has VIT=100, DEF=500
--If you are above the cap, (STR+1) is about equal to (ATT+1), and just under (MND+2) due to resulting attack.
--If you are below the cap, (STR+1) becomes equal to (ATT+5~10), and around (MND+7.5).
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The second image shows how your current attack affects the "value" of STR&MND by comparison:
If your attack is low, ATT+ becomes more valuable (ATT+10 = STR+2 = MND+16)
If your attack is even, ATT+ is very close to MND (ATT+10 = STR+1.5 = MND+10)
If your attack is high, ATT+ becomes less valuable (ATT+10 = STR+1 = MND+7)
Obviously your numbers will be slightly different, but provided you're below fSTR cap, some quick math indicates that
Flora Cotehardie should beat a Royal Redingote with ATT+10... in many (likely) situations...
wow...