Pins were (and still are) designed and sold for the most part to operators. Please see any speech Gary Stern has made in the last five years for confirmation of this. We as collectors are still not the main focus or target audience when Stern designs a machine. Go back and this is especially true when it comes to any game made in the 90's all the way back to the bagatelle. Wiliams and Bally never thought these would be in homes for the most part. Operators were and still are the number one target.
What does an operator want their pin to do? Make money, bottom line. It was the designers goal to make a game that was fun, satisfying, and gave you just enough fun for your $$$ money so that after you drained you would put another quarter in it. If back in the 70's and 80's the average person was able to play a pinball machine for twenty minutes instead of three minutes or less there would have been far less money going to the operators and I don't think pinball would have been around for very long at all.