Actually there is a somewhat healthy outbreak of botters in battlegrounds recently emerged and stated as using sophisticated macros. One youtube video points out this fact point by point through visual experimentation with a known botter. The bot /follows then /targets then /asserts faction, and then /determines outcome - all while following a path in a huge circle around the battleground. These macros are so well thought out that it was virtually impossible for the tester/guy showing us people exploiting, that he couldn't even lose the bots as ghosts. He was a stealth character too, and the bot still picked him up.
As long as there is a proper limit on the depth LUA can reach beyond UI, there should be no issue of botting or LUA exploitation. As of the past 5-6 months, WoW has shown that it can be done and in one youtube video, of a 10 v 10 match of WSG, 5 bots were discovered by this druid. So its getting worse.
If true, and I don't doubt you (I haven't played WoW in over a year) then Blizzard needs to close the loopholes. I'm sure they will. I find it interesting that it's taken folks this long to come up with these macros though. It apparently isn't easy and they're probably exploiting flaws in the system.
It appears (I don't know for sure) that Turbine is being pretty conservative and cautious with LUA. From what I've heard regarding their past experience with AC bots, I'm not surprised that they're being cautious. I applaud them for their caution. I don't want bots and I don't want gamebreaking mods.
All I'm asking for is the same approach with a decent macro system. Sure, there's some risk and they'll need to keep an eye on things. But there's risk to me every time I drive down the road. Some idiot may run a red light and t-bone me. That doesn't mean I sit at home in fear. I drive defensively and with necessary caution. When it comes to macros, Turbine is just sitting at home.