[zamadatix]

Premade ways of escaping the bounds of a browser viewport with styling like a system dialog box certainly sounds like something a developer would want rather than users or browser makers. It's not an accidental disappointment new things aren't made to function like alert() and friends used to, it also has upsides (beyond just "the old interface was not promise based".

I do agree <dialog> could have done with at least a little bit of TLC on the styling though, I just don't think it has to be 100% look and function like a system dialog outside the DOM to do it. Some base default styling to match the rest of the browser's default style would do wonders.

For PWAs (or any "web apps with more permissions than a random page should get just for being loaded") I could see where you wanted <dialogs> to go as a more well received idea though, similar to how there are separate things for styling the windows and interacting with the system for those more privileged pages.