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Chromium Blog: Towards HTTPS by default
(blog.chromium.org)
This is a most excellent place for technology news and articles.
Imagine you want to test your redirect from 80 to 443 when setting up your webserver.
While I think for the normal user this enhances security by defaulting to HTTPS, however this makes no sense for a browser. This should be enforced server side, the browser is for browsing, i.e. viewing. Not controlling and competing with the server software for competency.
Chromium is really leaning into bad code practice with the disregard for "separation of concerns".
If it's enforced server-side, then there's still an initial connection that is unsecured and can potentially be intercepted/modified before it gets to the redirect from 80 to 443.