Why would Apple bother with this? This is functionally them entering the "fitbit" space.

It's showing people neat graphs, which they'll rapidly get bored with because at the end of the day once you're even slightly away from reinforcing the feedback loop of "how much of a good person am I by proxy of my exercise/weight/calories?" no one cares and people specifically do not want to know.

Everything else about health is messy, full of legacy systems and liability, and completely facing away from the consumer.