They can't make it the default yet without breaking a lot of things since a bunch of marketing people decided to break the security properties of TLS by using H

They can't make it the default yet without breaking a lot of things since a bunch of marketing people decided to break the security properties of TLS by using HTTP only vanity redirect domains. While I've found HTTP-only to be most common, sometimes these redirects do support HTTPS but hand out the main site certificate without updating it to include the vanity domain, resulting in a certificate error (however, this new built in HTTPS only gives you a HTTP warning in this case rather than a certificate error, unlike HTTPS Everywhere's EASE). Some sites also have HTTP only redirect from example.com to www.example.com.