Ok guys, enough fun has been had so how about a practical response to OP's question?i know tell me about it. i centre it as often as possible but it always bloody moves
Most bike shops take it off as part of uncrating and preping a new bike.
Most will simply cut it off instead of fussing with cassette removal.
I mail ordered my current bike, didn't want to cut the disk, and was too lazy to bother with removing the cassette just to pull the so=called dork disk. And @copposteve is correct in saying that it never stays clipped in and moves around a lot.
By the time I got around to removing it a few rides later, it had rubbed off a lot of the black paint on the back side of the cassette.
So, there you go. Either procrastinate like me and lose the paint on the back side of the cassette or get it off ASAP.