I've been on this soap box for years and the devs only make things worse. I called it back then: they intend for throwing weapons to really only be viable as backup in certain melee builds, they don't look at throwing as its own class the way they do sword and boarders, two-handers, archers, cavalry or even xbows.
As far as I know there aren't any builds more throwing-focused than the one I use, and in this last patch I only got nerfed. I still have to invest the exact same amount of points into WM and Agi as before, and now I have 22 wpf less. I only just BARELY make the requirement for 11 PT, at 121 wpf. I play naked but now I don't even have the option to wear any "real" armor, assuming it weight lowers wpf like before.
The whole problem could be solved by getting serious about specializing the stats and functions of throwing weapons, rebalancing the types and tiers, but the only time the devs have ever changed the stats that I can recall was to nerf throwing rocks, nerf heavy throwing axes, and buff franciscas...wut?!? lol
Throwing lance shouldn't be lowered to 6 PT if what you're trying to do is get throwing to work right as its own class that people can dip a toe into at low tiers if they're hybrid or devote themselves to in order to access teh powerful shits. Keep PT requirements high for the best throwing equipment, but buff their stats so that they're actually useful. I have 11 PT and I've had throwing lance headshots fail to kill against plate helms, or take three or four lances to kill them if I land torso or limb hits, and I've had torso shots fail to one-shot archers. Throwing lances should be arbalests with faster reloads but a tiny fraction of the ammo and heavily restricted range, case closed.
There's no way to get any positive changes made to throwing balance while the devs who have been changing it are still in charge. There's a bias against throwing as it's appreciated by the people who play it. If you just post about it here they won't even read it. PM Tydeus directly on the forum or IRC telling him you don't like these changes, and use the IRC room to discuss it; they pay more attention there than to posts.