You don't see the shortstop stomp around in circles and shake his head until the second baseman comes over to offer some brotherly advice. If an outfielder can't catch the ball, you don't stop the game so his team mates can gather around and help him get his head together. If a third baseman has to come out after six or seven innings, you don't give him a standing ovation because -- wow! -- he managed to do his job for over half the game.
Yet, we do all these things for pitchers.
Some might say pitchers get all the breaks because they have to throw the ball many times every inning, while other players might throw once. But that's all they do. They don't catch the ball, although they might have one ricochet off them. They don't run, except to trot to the backstop when there is a throw to home plate. In the American League, they don't even bat!
Still some will say that throwing fastballs, curves, sliders, and so on puts so much strain on the pitching arm that it is physically impossible to make more than about 100 pitches. But, as we all learned on the playground: if it hurts when you do that, don't do that.
Granted, if pitchers pace themselves so they can keep the ball in play and go nine innings, there will be more hits and more score. Does anyone have a problem with that?
Also granted, more hits and more scoring, will make an inning longer. But think of the time saved when the catcher throws the ball back and the pitcher just pitches without all the soul-searching and without having to screw his courage to the sticking point.