No, performance and fidelity are definitely better with the canvas renderers, especially skwasm. Flutter is very inspired by React, but instead of React which does tree diffing to minimize rebuilds, Flutter tries to make rebuilds as cheap as possible instead - for example through its single pass layout algorithm. The issue is that this doesn't map well to the DOM. You can't rebuild cheaply on the DOM because you'd be constantly updating the DOM. And you don't profit from your simpler layout, because you have to implement it in JavaScript and use absolute positioning on all DOM Elements to lay them out.

I do agree that this all absolutely sucks for websites, but if you're building an App that is supposed to run in the browser like Rive or Figma, where you're going to override all click handlers anyways, or where where what you're rendering would be too much for the DOM, Flutter Web is pretty ok.