Comment by satvikpendem

It's because frankly the platform has been historically shit. Web components comes to mind as someone else here has mentioned, as it's just not a good API and needs wrapping to make it usable, same as IndexedDB which the author readily admits as a creator of such tooling. It seems like the ones who determine the platform aren't actually developers day in and day out and thus don't dogfood their own products while the rest of us do, leading us to reinvent the wheel.

Here is a great comment and discussion (scroll down) by Ian Hickson who wrote the HTML5 spec on how the platform has essentially failed on its promises causing everyone to write everything in JS or even other paradigms like Flutter and other WASM or canvas based frameworks that eschew the web entirely: https://news.ycombinator.com/item?id=34612696