A good friend, very lean Olympic marathon runner, shows up for a physical at 35 with an enlarged heart... his md initially panicked of course, but hey, when you can and are running a marathon every week your heart has to enlarge to increase it's stroke volume. He still runs 10 miles pretty much daily. and is now 67. The issue with BMI IMO, is the inability for this calculation to take into account body composition. It is the same with Body surface area vs weight for dosage calculations for medications.
You have to be aware of the subtle differences. and where the tools diverge from each other and when one is better than the other to use. Just saying.