Yep, what's missing is a WebView standard for desktop, like Android and iOS provide. Where these apps are a thin wrapper around a system provided browser engine. And let the user choose the engine (gecko, blink, servo, ...).
A standard interface for web views would be great, I’d love to force everything onto a consistent version of Gecko, but really we need a new native cross-platform batteries-included framework with controls and layouts for 90% of standard business scenarios.