Never understood the two takes label. So Sir Patrick, Dorn, Sirtis, McFadden, Burton, Spiner or himself when in shot never messed up their lines? lol.. Based on some Youtube videos, seems they needed more than two takes often than not.
A good chunk of TV/film making also includes establishing shots, like shots for setting or panning or crowd shots, too. How many takes would you need to watch Geordi walk from the warp core to the center table in engineering, for example? Or a random shot behind Data and Ro typing away while looking at the viewscreen? Or even a computer panel that will be filled later on by the sfx crew? The ones with actual lines are, in their own way, trickier because then that's something that the director has less control over.