That's true to a point. Extra fat based weight is harmful that's just a medical fact.

How much is too much for a specific individual can be somewhat variable, and body composition matters.

BMI as a tool can be clunky and not ideal at times, but if you're more than 1 point off the healthy range and you're not a body builder your health will be impacted (over time).

I'm overweight myself, but I don't try to convince myself I'm in peak condition.