But that doesn't mean that every person with a certain weight/BMI is at increased personal risk

Actually, yes it does: your claim here is factually incorrect. Being overweight doesn't mean those people have those problems, but it absolutely means that they are at increased risk of getting them. That's what it means to say that "weight is linked to hypertension etc."

rather than just lecture those whose charts tell me are "overweight."

Nobody in these comments has suggested this route. There's a major difference between "informing" someone, even if it's not something they want to hear, and "lecturing" them.