I agree with you except the one pain point that Wikipedia still continues to use "m.*" sub-domains for displaying mobile content. I know most people exclusively use mobile these days but I use desktop browsers for reading more than 60% of the time and its really annoying to click on a Wikipedia link on HN/Reddit and having it open the mobile site on desktop. It's OK to use m.* subdomains instead of reactive design but there should at least be redirects to the correct subdomains.
edit: formatting