Sports are by nature ultimately pointless entertainment. They are all "bullshit". You may feel really strongly personally, but that doesn't necessarily mean that the majority of fans agree with you.Yeah, I don't agree with any of this, I think it's just what fans have gotten used to. And boxing and tennis are individual sports, baseball is a team sport.
If the NBA cut down games to 36 or 40 minutes so that teams almost never had to substitute, that would help this kind of bullshit narrative but it would also make the sport worse IMO.
Fans may be used to starting pitchers pitching deeper into games, but that doesn't mean the new optimized max effort reliever brigade is more interesting to them. I've seen years of both and I know which one I am more drawn to.
Lastly, baseball is probably by far the most individual of team sports. The vast majority of the game is 1 vs 1. I think the narrative matters to most people, to different degrees