We definitely should make clear distinction between what we would do in real life and what works in this game. That is, what is actually programmed here. The assumption that all tiny details are programmed, is probably baseless.

For example, let's say, during the game, at about minute 60-70, I replace two players who are most tired, their condition being about 70%, by players who have 100% condition, and are close by quality. One might expect some jump in possession, but it does not happen. Which probably means that the game is not programmed to take into account players' conditions at the moment. And you think it looks at the height/weight? :-)