You just reinforced his argument, that means that it gives you an edge over combat and magic based characters.
ALSO: I thought you needed a guy to be around for you to level sneak. Of course, that means you can just autorun near rufio or in a jail cell.
Well yes.
Just as casting destruction spells a lot gives mages an unfair advantage over thieves when it comes to destruction?
And even if you have to be moving, what is stopping a guy from programming a simple macro to sneak circles around an NPC.
You cant counter for these things, because it is intentionally circumventing normal playstyle.
If you took into account each and every way such a thing is possible you would end up with a very limiting and sterile linear game. Look at bioware for good examples.
You cant work against all of these things, its pointless and unneeded. I hope they focus on catching and removing things like the floating paintbrush glitch or the infinite money glitch, wich are of a different category alltogether.
Those are also unintended features, but in this case its very easy to run across them, you dont have to metagame for it.