There are tons of sites where http and https are different content; for example the https might be an admin interface, or the IP could have multiple domains but

There are tons of sites where http and https are different content; for example the https might be an admin interface, or the IP could have multiple domains but only a couple of them support https, or the vhosts could be very misconfigured. The HSTS and other browser things that force https often do not allow any way to get around this. I often have to resort to creating a new browser profile from scratch and trying hard to avoid https when loading the page. So please allow some way to deal with this sort of issue, for technical folks at least. Edit: if you search for "forget HSTS", you will see how hard it is to avoid this on some browsers.