It's really just an accident of history. There was a sudden explosion of client platforms in the mid-2000's and the existing solutions for cross-platform UI we

It's really just an accident of history. There was a sudden explosion of client platforms in the mid-2000's and the existing solutions for cross-platform UI were expensive and slow-to-modernize (QT), poorly suited to applications (game engines), or outright murdered (Flash). But HTML/CSS/JS SPA's were becoming a mature application platform in browsers during that same time, and brought with it a huge generation of new developers that learned on those technologies first. When demand swung back to desktop apps, they brought their tech stack with them. You can make arguments for whatever technical merits you want, but they're all just differences seen in hindsight. It was mostly just a de facto win.