It&#x27;s because they don&#x27;t want to add buttons, because buttons are &quot;ugly&quot;, and usability takes a backseat to looking pretty in screenshots.<p>My estimate is that the average person knows about maybe a third or a half of the features on their smartphone, because the rest are hidden away behind never-explained gestures or long presses on things that don&#x27;t look like buttons.<p>In terms of conveying functionality the popular smartphone and webpage UIs today are atrocious.  Just today I was talking with someone who was really frustrated that they can&#x27;t see webpages anymore because web browsers all got rid of the magnification feature.  He was amazed to discover that it has been there all along but hidden away in a menu that doesn&#x27;t even appear unless you hit alt.  He thought all of that was moved over to the &quot;hamburger&quot; menu, and they just dropped it.  He&#x27;s been squinting for months (years?) because someone doesn&#x27;t like the look of dropdown menus.