"Team play is cheating" is an interesting concept and one I really haven't heard before. I can see some merit to that argument. My fellow counters won't like my reasoning, I am sure.
I play blackjack for a living, my 14th year now. Living in a city with many casinos and tables in close proximity, I have tailored my game for my situation, meaning I exit negative counts (wong out) very aggressively. Why do I want to play negative counts when there are better opportunities close by, like the next table.
I frequently track multiple tables, the game I am playing and a neighboring table, looking to jump to a better opportunity with zero downtime.
So, I will never accept the argument that card counting, and/or wonging, is in any way cheating. How can thinking be labeled "cheating". Only in the casino industry's eyes.
But with team play, the traditional call in approach, the player being called in is not the one doing the thinking. His teammate is, And when that information is passed between players, you can make the case that is colluding, and not a stretch to consider that "cheating".