I mean, yeah, I agree with you, but think of it this way:
I don't have a citation on hand, but I remember reading a while ago that when it comes to general health outcomes, it was about 70% genetics and 30% personal choices (don't quote me on that, can make that number even 60/40 or 75/25, the point will still stand).
Which makes sense, a lot of people here probably know someone who did everything "right" in terms of their health choices and still got hit with something nasty (e.g., active lifestyle, eating healthy, etc., and still got cancer or covid or something else), as well as someone who did a lot of things wrong and still had a decent outcome (e.g., my grandfather who has been smoking a pack a day since middle school, been doing hard manual labor, and is still kicking in his 80s).
And sure, it seems daunting that your health choices can affect only that 30% (rather than 70%). In blackjack, however, the house edge against an average player is about 2%, and about 0.5% for perfect strategy pro players. People spend countless numbers of hours practicing memorizing (and executing) perfect strategies just to give themselves that extra 1.5%. While with just basics of taking care of your health, you can take charge of the 30%.
That's quite a massive effect that taking care of your health can have on your outcomes (and your life), even though your genetic health predisposition still has the edge.