If you can reach the Steam website to buy a game and then you can't install it, because the site has IPv6 but the app doesn't, it is much worse.

Why does that make a difference? You can have both.

We should have both, that's the point, to which you replied that "the site's intent is to show the general population's ability to organically reach those sites". I disagree with you, for many of those apps having only the website's status in the dashboard is insufficient.