Tactical in my eyes does mean exploit, at least as far as the enemy's "natural" limitations, though not necessarily the game's. Bring a gun to a fist fight? Yes! Were I to fight, I'd fight to win, not to see who's best in "fair combat". If the dlayo's aren't smart enough to back away from the wall when someone's pelting them with magic willy-nilly, that's their deal. But don't do it and then complain if (when?) they get smarter and come 'round to beat you up, or if something goes wrong like them disappearing -- maybe they finally ran away!
This game is no-where near final, things continue to be improved. A little while ago you could "climb" by repeatedly jumping, and when the glitch finally got fixed, people got mad because the devs fixed a bug. Huh. If you're exploiting a bug and a GM doesn't say anything about it because it generally doesn't harm anyone and it hasn't been fixed yet, fine. It's your choice whether you ignore it, or if you exploit it. Just keep in mind that the current behavior is not the intended one, and won't last. Hopefully it'll be fixed soon but if it isn't it's because the devs have to balance day jobs, a social life, and dealing with programming and design issues that may seem simple to those of us on the outside, but rarely are so once all the little interactions are considered. The beauty of Open Source is that if something really bugs you, you're free to take the code and do something about it. And I'm really not being sarcastic in saying that, though sometimes I think we all need to be reminded of how much work all this represents.
Basically, we're forgetting that the game is still lacking features, such as a (even) better AI, racial modifiers that I'm sure include stat maxima, and many more that are part of a balanced vision for the game. But the game's not yet there, and probably won't be for a while. It's still very playable though, and until the game's mechanics are implemented to a point where they actually have a bearing on these philosophical discussions, I really don't worry too much about it.