I was playing around modding a single player game from last decade the other day and was amazed to see some well known hairs from SL are there too (probably older assets and such), but they (the modders) made the same hair even better using HDT-SMP which I don't know what is, but it looks great.
It moves when I jump, flies when wind hits my character, swiiiiishes when I swuuush. Better than what we have here, and better than flexyprims. And it broke my game and crashed my PC, but that's not the point, the point is we are sandbox-y, while they are just injecting dlls and getting prettier. Rally the troops, we must win this!