Adjusting physical hit boxes can usually be handled by artists / designers as most hit boxes are physical 3d Geo (The fact that he talks about the artist that works with him supports that this would probably be no different here then at other places.)
HSR and net code fixes on the other hand needs development support. Sure you can probably put the artist adjusting host state rewind and netcode, but I'm willing to bet that you might not get the results you want.

I'll reserve judgement on these guys till I see them In Action. I'm personally hesitant to see arm areas extend up into physical torso geo due to how that geo can then create "Shields" when they don't fall off upon destruction, but I'm more then willing to see how it is in the final product before making a decisions on if I like these changes or not.
In either case, its good to see forward progress be made on them. Hopefully things went well with the Artist's personal matters.
Edited by SpiralFace, 19 December 2013 - 11:53 AM.