18 inning games are very rare though.
In 2018 Red Sox pitchers threw 1458 2/3 innings.
162 * 9 = 1458
The extra innings were basically cancelled out by the games where only 8.5 innings were played.
Extra innings, and the absence of a time clock, are one of the things that give baseball it's unique character.
That's just my personal take, of course. I can see why there would be differing opinions on the matter.