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Is BMI perfect? No. But most people who cite its shortcomings pretend that the edge cases like extremely muscular athletes have any relevance to most of the population.
It isn't edge cases. The BMI tells you literally NOTHING about a persons health.
You mean "Fit but Fat?", yeah, nah, fat people only believe that.
In the same way blood pressure tells you nothing about a person's health, yes. In the same way a college degree tells you nothing about a person's intelligence, or their number of active friendships indicates their social skills.
Just because something is itself meaningless does not mean it is not a broadly useful indicator. But no, the vast, vast majority of people with unhealthy BMIs are carrying very unhealthy amounts of fat. There are some edge cases involving athletes or people with extremely odd build types. And the precise level of where we define overweight or obese really should vary a bit from person to person.
But I'm sorry, 99% of people with a BMI of 35 have a serious weight problem. People just citing Olympic athletes and other fringe cases out of cope and denial. BMI is imperfect, but claiming it's meaningless is just wishful magical thinking.