Well, how dare there be a confliction; or a need to do coordination to the sectors about the aircraft about to launch into their airspace; the nerve of them imposing a 'clearance'.
All clearance delivery's have different procedures, something they are looking at in the 'bigger picture'; but it may be coupled with another thread here recently with non-ATCs doing it. For example Canberra is very different from Sydney.
Geez, purleez... Seriously though, ring the tower and talk to someone who does it (to you); go for a visit and learn "why" they do it; depite our reputations we actually like to explain why we do things, to stop argy bargy and increase knowledge all around.
Chimbu, bring them plates on here too; sounds great.