CR,
Not having a go, it's hard to not be confused these days as everything seems to change quite often. The bit about being busy, cause there may not be alot of radio noise, doesn't mean we're not busy! We've got quite alot of manipulating and 'feeding the elephant' to keep it all running.
My main point is that change for change sake is a pain in the ar!e especially this callsign at the end of a readback business. You can do things a little bit quicker if you know the correct aircraft is reading it back. Flight number callsigns has complicated things even more. Was this change for changes sake? Either way, a deadset pain in the ar!e.
