That’s your grip, I guarantee he doesn’t recommend that you hold random items in your off-hand while throwing. especially if you’re focusing on finesse.
That would be because he’s not training people to kill things, he’s training them to hit targets. It’s a sport, not survival. IRL if you’re trying to take down a person/animal/whatever with a throwing blade, the goal is to either get in a vital hit (mostly somewhere deep in the torso, but precision hits like blood vessels would certainly work), or a number of flesh wounds to make your target bleed out. It absolutely matters how hard the weapons hit in order to penetrate more and either make a larger wound or hit something vital. If you’re throwing a rock or other blunt object, the goal is to maximize the force to make a large bruise or maybe break a bone.
I would say that normally IRL you’re going for one hit to disable or kill a target, and that throwing weapons are quite bad at that, but I do think that throwing at quite close range in order to injure a target before finishing it off in melee is a viable and valid thing to do.
No, because as difficult as it is, it’s still a thing you can do to improve your chances of survival. In addition to moderate effectiveness in combat, you can hunt with throwing weapons when coupled with stalking, and that’s certainly something we would like to handle.
In the case of thrown ordinance, it is a lot more about range than accuracy, but even so, it’s very valuable to be able to throw a grenade exactly where you want it at a moderate range rather than placing it in a general area.
And these details are where your, “simple” request falls apart.
Javelins certainly, but spears are generally not made for throwing, they’re far too heavy and too large to throw.
Hatchets and knives are universally terrible at being thrown, the balance is intended for swinging, not spinning. You have to completely redesign the knife/spear in order to make it throwable.
Well that’s certainly a problem, but that’s a nerf the golf club needs, it doesn’t justify making knives better.
Repeat after me, “features in the game do not justify other features in the game”. It’s a circular argument.