The point being that, IMHO, extensions over ESBuild tend to not improve the developer experience because they have a tendency to bloat and steer towards being "webpack but esbuild", which defeats the point of esbuild, being the "anti-webpack".
Tools such as Vite, aren’t designed to improve the developer experience of ESBuild. They exist separately and leverage ESBuild’s strong qualities – JS, TS and CSS bundling and minification.