playing a sf at the sf position gives one the ability to withstand a variety of defenses 3-2/2-3 especially and defense strategies (+5 to -5), that playing a G or PF there does not. In d3, the problem is the sf's are lacking something, same as a SG/PG or PF/C would be, in d2, not so much, and in d1, I want sf's on my roster.
In d3, if a SF gets to 600, 200 of those points will be dur/st/we more or less by the time the kid graduates, which leaves 400 for the other 9 categories, which means an avg of 44 per skill. even if SB is 20, the player still is less than 50 per skill. Still, I would guess a near 50 at everything SF is going to be a pretty good d3 player, especially if the right skills are in the 60's/70's and in the 30's/40's, netting out to the ideal 600 sf.
funny thing is, I don't think you will find any 2 HD coaches to agree what the right things are, which makes SF the most interesting position in the game