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Fangraphs isn't arguing against bat-first players. They are merely trying to figure out overall value. Do they rely too much on UZR? I'd say yes, but that isn't neccesarilly the point here.
For YEARS OBP and SLG was an underrated asset in MLB. We've come full circle. GMs are now overpaying for HRs. Defense and baserunning are becoming underrated.
The key is in figuring out a guy's overall value. Offense is still the most valuable asset, but its important to calculate those other factors to figure out what a guy is really worth.