I don't think the snarky checklist is necessary and am pretty saddened you've got upvotes for merely stating the obvious in such a derisive way.

We don't know the context in which the creator made this, and who is to say that just because something is written in HTML you have a God-given right to be able to run it in your desktop browser.

I hope more apps like this do appear and push e.g. Android to sort out their home screen/web app integration. We should be able to have the experience this app provides on iOS everywhere by now, here's hoping Android get this sorted soon.