I'm one who thinks that most left-handed players SHOULD be platooned. I certainly understand the sentiment of playing guys everyday until they fail, but I don't think Frelick needs 650 PAs this year. 450-500 is plenty and if that gives more ABs to capable players like Perkins/Monasterio/Ortiz so be it. I like a fresh, engaged bench.
I certainly hope that at least Frelick does get SOME ABs vs lefties and if he is successful then perhaps he gets even more chances, but there isn't anything wrong with a "soft"-platoon IMO.