When not to use Aegis

A single-page application with client-side routing for everything. Aegis has a router, but its home is a server that renders pages; if the server only serves JSON, a SPA framework fits better.
A team that lives in JSX and the React ecosystem. Storybook, React Native, thousands of components: those are not Aegis, and they are not coming.
A dropdown or a tab strip on a static page. Alpine or Petite-Vue is smaller and enough.
Every state rendered by the server. If htmx alone covers the page, add Aegis only for the islands that need client state.
Browsers without ES modules. Aegis ships as an ES module; there is no ES5 build.