I don't know if it's supposed to be, but atm it seems like throwing is just a sidearm but you cannot effectively play it with a pure build.
yes, that's what it's supposed to be.
btw, war darts ARE effective. didn't believe this myself, but they're relatively accurate and have pierce damage! overall i could kill people way more often than with my heavy throwing axes.
ofc, you'd have to loom them for maximum fun
EDIT:
I roll with 21/15, 7 PT, 7 PS, 7 IF on lvl 31, and I use balanced heavy throwing axes for now. war darts are my choice when attacking on siege, more ammo and more effective reach.