I think it's a change for the better, an alchemist that's lvl 50 and can only grind bones is frankly somewhat lame.

Using 3 alts to hand in work orders completed using another character seems to be currently allowed. Personally I wouldn't do it and doubt many would it feels to me the whole mechanic is being bypassed to gain extra profit. I assume if dev's felt it was an issue it would at sometime get addressed.

With the exception of combat skills I tend not to overly grind the skills, unless there is a recipe or something I want higher up or I'm trying to make a little coin.
So to be honest much of the above post seems somewhat moot to me.
It seems a little odd to spend hours making stuff I don't need now to reach a level cap, only to next week need something making and then get no exp for it.
Each to there own.