the only people that give a fuck about creating static sites would much prefer to use a (free and local) IDE and a terminal

Yup. When I was in college, they assigned everyone with a task to design and develop a website for a local business founded by the elderly and for the elderly. Worked super hard (was just getting into web design and dev) and created, what I and my friends thought, was a beautiful site form scratch. I thought I had a good shot at winning but they ended up picking a website that was covered in one color and used a very basic free pre-built bootstrap theme. It even had a little footer that said ‘theme from xyz’ at the bottom of the page when they presented it to the client. Old people and their taste can be surprising.

For those who don't know, Warner Bros keeps this anachronistic website online

code leveraging Buffer-specific methods needs polyfilling, preventing many valuable packages from being browser-compatible

If the differentiator is the ease of putting a new application out into the world, that value prop is competing against the value prop of e.g. today’s full-stack web frameworks, right?