True, but isn't actually the point of newer Qt point releases also to bring performance improvements and lot's of bug fixes?
Don't you see the irony that a device what is build on the premise of Qt lags the newest improvements of the toolkit compared to all other platforms?
I think it would be really great to have an updated Qt WebKit or even the new Qt WebEngine module. All apps rendering web content including 3rd party web browsers would greatly benefit from it. Also Jolla could switch finally to GStreamer 1.x with Qt Multimedia. Besides this the SFOS SDK could use a newer version of Qt Creator for development.