PAXboy
This new tray format and meal service has been in use for about 2 years now... The exception to the separate hot meal then dessert service is on shorter late night flights where it is all offered together at the same time.
As for the jugs sometimes logistics and the space onboard can make it hard to guarantee either pot can only be used for just a single type of hot drink despite it seeming just a simple task... I can say though most crew will try and separate them however and make sure they are well rinsed before each use so not to be serving the well know inflight t-offee