Just gonna be real for a second: The big, actual problem is that STR isn't on Fending accessories by default. No matter what calculation they run for stats, it still means that in order to fully benefit you need to meld those primary stats onto your accessories. No other job has to do this, everyone else is free to meld secondary stats (which have a much lower weight). This really isn't fair and hasn't been fair since forever. They need to add STR to Fending accessories and then whatever calculation they do with VIT and STR from there doesn't really matter because we'll always want Fending accessories and they'll freely be able to adjust any of the values on them.