I think it's probably a comfort when you are performing in front of a massive crowd of people to have mastered what you are playing. To rely on that muscle memory to get you through a three hour show. It's like any job. You change up the flow and it takes a while to work out the kinks, get it down and have the whole thing run smoothly. Don't fuck with my work flow.
How we perceive the same song over and over again is probably not how they perceive it when they perform it. I doubt when they listen to music at home they play the same song over and over. If you're tired of the band playing the same song over and over again, that's on you. You're the one who has it on repeat.
I know when I'm trying to get the streams for you guys, I don't really listen to the music. I know when absurd is coming up and think cool, I can take a break.