BMI is unfair to short fit people as well, especially people trying to put on muscle. I'm 5'8", 168 lbs. According to BMI I'm overweight at 25.5, but I just had a bod pod test done last week and I was only 16% body fat. When I get down to the body fat % that I'm aiming for (12%, hopefully by the end of August), and start bulking, I'll probably reach the 30 BMI mark by late October, but still only be around 12% body fat (maybe 14-16% cause I'm not super strict with my macros when bulking). At the end of the day, you can look at somebody and know if they're fit or not, regardless of their BMI. You don't need to know Dwayne Johnson's BMI to know he's fit, and you don't need to know that butter fairy's BMI to know it's morbidly obese.