In a negotiation, the goal is to reach an accommodation suitable for both parties. If the web developer doesn't want to set up his server on port 80 to serve HTTP, that's his business. Your user agent is still working for you, when it negotiates with the server what protocols it will accept. (It also negotiates a content type for the response; and if all the server has is static HTML, it's not your user agent's fault if what you get is HTML, even if you really wanted some other format. Take it up with the web developer, if you want the data in some other format. The browser is just doing its best for you.)
Your argument makes sense in one narrow circumstance which is not the typical HSTS setup: if the server is serving the site with plain HTTP on port 80 (and not just a redirect to the HTTPS version of the page), and also has a HTTPS version with HSTS headers. (So that the first time you visit the HTTPS version, your browser will insist on taking you to that version every time.)
Your argument makes sense in one narrow circumstance which is not the typical HSTS setup: if the server is serving the site with plain HTTP on port 80 (and not just a redirect to the HTTPS version of the page), and also has a HTTPS version with HSTS headers. (So that the first time you visit the HTTPS version, your browser will insist on taking you to that version every time.)