As a regular user, I can't just use a captive portal to get free wifi, because any site I go to has HTTPS, so they all break and I can't accept the god damn HTTP accept page unless I can conjure up a valid domain that has no HTTPS like I'm Svengali. Now all the OSes have special checks to see if there's a captive portal because the browsers couldn't be troubled to build a function for it, even though it would improve their security and usability at the same time.
Captive portals are not the enemy. Shitty UX and a bad attitude toward the needs of real users is. Locking browsers/protocols down more is just doubling down on this mentality.
Were you writing a forum post? It was lost because it got submitted to captive portal. Were you in dynamic app? It crashed because it got HTML instead of JSON. Does you page reload ads in the i-frames? Your page position and page itself is now lost, and you are in captive portal page. Did you have a native app which did HTTP requests and cached them? Congrats, you have invalid data in your cache now.
And I have seen captive portals which were broken. How about you get redirected to login page every time you go to your favorite website, because the redirect page got cached somehow?
Good riddance. Yes, the browsers should include better captive portal support like android does, possibly triggered by the SSL certificate mismatch errors, but even the current situation when I have to type "aaa.com" by hand all the time is great.