If you want free attribute increases without the effort, set gameplay to ‘watch full game’ (instead of sim screen or skip to next appearance) at the beginning of the game for one pitch, then change it to one of the other settings. You will gain attribute points for plays that are simmed that you are involved in (performance evaluator will show them).
I don’t think you get points on simmed plays otherwise.
Setting it to watch full game must switch point accumulation on, and it mustn’t get switched off when changing back. I think it’s a bug.