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What drove this home for me was the inclusion of a separate measure for BMI.

I've already given it my height (hopefully static, but apparently deserving of a line graph), and my weight. Yet apparently calculating my BMI from these inputs (admittedly a crude measure of health) is beyond the capability Health app?

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BMI is only intended to measure health at a population level, it's too crude to have any useful input on personal health.

And height isn't static if you're an adolescent.

Exactly - and yet BMI is one of the metrics included. Meanwhile a manual input is required, despite having been provided with the relevant data.

Perhaps this is a concession so that people who do not want to work with BMI do not have to by default. As minikites says, on a personal health basis BMI isn't very useful so folks may want to skip it altogether.

There are devices which measure BMI using conductivity. Given that a device may report a value other than the simple function of height and weight, it seems prudent to have a spot to put it.

I think you are thinking of body fat percentage. BMI is literally a function of height and weight.

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