Thanks for the quote Speaker.
I still think what civ_steve said is in a grey area. If I understand what he said correctly he was advocating settling a city right outside the enemies territory so as to grab a space that is two squares from the city center, but outside the cities 21 squares (i.e. 2 squares North, South, East or West of the city). Now you own a square that is close enough to bombard the city with Arti and have tanks attack in 1 turn (assuming there is a road there already). I don't think that counts as an Throwaway Cities exploit does it? Especially if one intends to keep the city and raze the enemy one. I do this myself on occasion (really just to use my tanks, I don't use stacks of Arti unless I am coming from behind - I find it a bit crude), it would be no harder to wait one more turn to attack (but I'm impatient that way). I'm just not seeing the exploit. In fact the AI will settle in this position, just not for the explicit purpose of gaining a square to attack with tanks in one turn.
I think you are correct that it was beachhead cities in LK38 and they weren't abandoned. Nor were the closest Korean cities, which leads to my next question. What if you found a city inside the enemies territory, take the nearest city, and then keep both? That is effectively the same as the beachheads we used in LK38, is that a RBC exploit? I would say that is more of an exploit than what civ_steve advocates above.
Edit: I know you aren't the final authority or anything, I'm really just interested and trying to engage you in debate.