Metabolic health =/= health. Obese people who are metabolically healthy are still at increased risk for adverse long-term outcomes (like heart attack) - source: https://pubmed.ncbi.nlm.nih.gov/24297192/. Obese people are 96% more likely to have heart failure - source: https://www.medicalnewstoday.com/articles/317546

Sure, I'll grant that BMI is not the end all be all metric of health, but its a hell of a strong indicator, and pretending that its okay for your health to be obese is farcical.