[michaelt]

Depends how you define 'app-like experience'

If I start with 1990s ebay, does it become app-like when I add the ability to zoom images without a pageload? When I add a WYSIWYG listing editor? When I let people drag and drop images into their listings? When I add JS infinite scrolling to search results? When I add AJAX search autocomplete?

Or do I have to go as far as Google Docs, re-implementing copy/paste functions, taking over the mouse wheel, and adding my own text highlighting and zoom implementations?

[brigandish]

My personal "line" is when links won't work without js and urls aren't written in the location bar. It makes a site quite useless without js. I know that progressive enhancement is supposed to be a thing but I've yet to see it outside of tutorials (browsers not properly supporting PWAs could be part of that, but I doubt it).