This thread isn't here to argue about realism.
You're right. However it is to argue about balance, which should be based on LOGIC. Sometimes logic and realism happen to coincide.
Throwing, out of all the ranged, makes the least logical sense to balance around the idea of a "dedicated" thrower or throwing ONLY character. Throwing, logically, is purely a hybrid concept and complete shit if used as the sole battlefield tactic of a warrior. For one, it's extremely cumbersome. We've gotten rid of most of the illogical shit that melee could do (pulling a pike out your butt magically, flamberge in your pocket, etc) and the slot system serves a more logical purpose of stopping melee from carrying said magical pocket pike + spamberge + board shield + great maul (etc).
Unlike archery, who's arrows fit into a quiver by the bunch, and x-bows who's bolts are even smaller and more compact, throwing weapons are bulky and often times taking as much room as a 1-hander or 2-handed weapon to carry. Running around with more than 2 throwing lances for example is rediculous. As is carrying anything BUT those throwing lances and maybe a small shield on your off hand and a weapon on your belt. Throwing axes? How many throwing axes logically is someone going to carry? About as many 1h axes as they can carry. Daggers, shuriken, darts and hell even the javelins at least have a "quiver" they can be stored in but how many should fit in there? With the larger ones (javs and such) it's like running into battle with a golf-bag on your back. You're only going to get one unless you ONLY plan to carry them and not fight/throw at all.
Logically, throwing only makes sense when it's used for infantry hybrid purposes. A sidearm weapon to hit that runner/archer. Something to soften up that shield as you approach. Maybe drop a horse. But that's it. Granted I'm against artificial WPF restrictions because they don't make any logical sense either. Someone can absolutely pick up any weapon without any training (1 wpf) and attempt to use it. They'll just suck at it. A more pronounced curve for wpf would be a much better route. 1 wpf and your shot goes randomly into the wild. 100 wpf and it's far more on-target, etc.
Balancing for a "dedicated" thrower is just silly and illogical. Throwing weapons should be those things that you use if you have an extra slot and figure "fuck it, why not".
I'm all for getting rid of this arbitrary artificial wpf restriction, but the low ammo counts, and high slot requirements should absolutely stay. Throwing should be balanced for a hybrid sidearm for infantry rather than some silly "dedicated" idea. A PAIR of throwing axes (two, dos, zwei, ni) to go with your sword and shield, polearm or two hander. A quiver of maybe 3 javelins on your back if you don't want the axes and want to invest more points. Throwing lances should go, or remain 2 slots for ONE lance to keep them from being the silly absurd item they were before.