In the early access FIN gave 1% increase to dodge as well as damage increase and STR/INT gave additional physical/magic armor respectively. It was dropped at some point unfortunately. WIT kept its secondary 1% crit in addition to +1 initiative (but with initiative changes the crit is the more useful part now really).
That was a nice mechanic as they do seem a little one dimensional now. If I am playing a STR based character there is no benefic whatsoever putting points in FIN or INT except wearing certain armour.
