[amaury_bouchard]

The sweet spot is everything between a static website and a full SPA, which is actually most of the web. Think e-commerce (filtering, cart updates, pagination), dashboards (refreshing metrics, notifications), admin interfaces (inline editing, form submissions), content-heavy sites (live search, comments, modals). Basically any app where the primary interaction is 'user does something, server responds with updated content'. For drag-and-drop kanban boards or collaborative editors, you're right, µJS is not the right tool. But those are a small fraction of what gets built every day. Most web apps are glorified CRUD interfaces, and for those, server-rendered HTML fragments are simpler, faster to develop, and easier to maintain than a full SPA.