In theory the poster is correct and outside europe thats the way it is done.
With euro control and all the other good things we have it makes life very much simplier for the pilot for a ATC point of view.
As the other poster says things arn;t really geared up the same way for VFR as they are for IFR traffic so sometimes you can be "lost" in the middle and have to freecall wing it.
And most things are sorted if you change on route by asking the first service that you speak to away from your flight planned route to give your arrival airfield a ring if its controlled and tell them whats happening.
If you are going farm strip to farm strip it gets a bit more complicated.