Sure, if the only metric you care about is "how easy is it to try out my project" then making a website makes sense. That's a very single-dimensional decision

Sure, if the only metric you care about is "how easy is it to try out my project" then making a website makes sense. That's a very single-dimensional decision making progress. You're nowhere near convincing that all UIs must be made with a website. Even if we restrict our view to UIs made for businesses for the purpose of making a profit, native apps make a lot of sense. Just think of any big tech company; they all have robust apps and consumers largely prefer the apps. You can order door dash or an Uber in a web browser, but people almost always use the app because a good native app is a better experience than a good website app.