superfluous, or egregious examples of bad web dev??
Do you know what Web 2.0 is? Do you know what are React, Angular, and the other JS Frameworks?
When you create a modern webapp, a lot of data are retrieved from servers as Json and formated in the browser in Javascript. Even sometimes Css is generated on browser-side. Even more, on webapp where user login is taken into account, the display is modified accordingly.
That's the web of 2019. The approach consisting of geting remote files and launching them in a browser is really naive.
Speaking of SingleFile, it as a cli version and can handle full web 2.0 webapp without any problem. And of course, the Web 1.0 webapps work as well.