I would qualify this: The web is simple when one uses it as intended. (hyperlinked documents that may or may not have interactivity beyond the hyperlinking and embedded media or animations etc.) The web is complex when one attempts to do "GUI by RPC". If one is OK with page reloads, this asynch remote folder browser hypercard thingy is fine. If one seeks to replicate the event-loop desktop "window"-based application one will have the use-case for large frameworks as one will literally be re-inventing all the wheels, which they tend to do, as this is not the default behavior of the application we call a web browser.