We have a website presence too, and the website UI (as visited in a normal browser) is 95% the same style and functionality as the desktop app.<p>So when you browse to our site via the desktop app, certain OS-only features turn on.<p>So it made a bunch of sense to use QtWebkit.    I welcome the switch to QWebEngine though, if for nothing else in the hopes that the underlying browser code gets a update and the app will hopefully then feel more responsive.