> They're trying to solve the "how do log into this captive portal" problem, and they needed to make this change to handle that typing "neverssl.com" now often evaluates to "https://neverssl.com".
So, yes, it's still useful for WiFi logins. The change in question was specifically for that purpose. https://neverssl.com now redirects to http://neverssl.com so you can log in to WiFi even if your browser thinks it knows better.
Where can I go that has a bigger payload? When I've successfully opened a site on an unfamiliar WiFi network I'd like to know up front if I'm gonna have trouble loading stuff.
captive.apple.com is just for captive portals - technically networks can (and do) spoof it, but it's just a connectivity check. Past that you can do any test you want over https.