The problem is the libraries. Browsers are still mostly incapable of delivering usable workable building blocks especially in the realm of UI. https://open-ui.org/ is a good start, but it will be a while before we see major pay offs.
Another reason is that the DOM is horrendously bad at building anything UI-related. Laying out static text and images? Sure, barely. Providing actual building blocks for a UI? Emphatically no.
And that's the reason why devs keep reinventing controls. Because while details/summary is good, it's extremely limited, does not provide all the needed features, and is impossible to properly extend.
Another reason is that the DOM is horrendously bad at building anything UI-related. Laying out static text and images? Sure, barely. Providing actual building blocks for a UI? Emphatically no.
And that's the reason why devs keep reinventing controls. Because while details/summary is good, it's extremely limited, does not provide all the needed features, and is impossible to properly extend.