Veeeeery easy:
CO writes down the given and coordinated dircet clearance onto the strip
It happened at Maastricht UAC; Flight Data mini strips were updated by a Co-ordinator who was not sat next to the executive. The strips were about 14 cm long and had no place to put this info on.
What if the pilots had found an intersection with sounds like MINTI and had selected a heading towards this unknwown fix......uhhhh...
not a lot, The controllers at Maastricht concentrate on a dynamic display, not a collection of scraps of paper which may, or may not, represent the actual situation, Again, this is a thread for humour - to quote something often heard there in the past, "German humour is not a laughing matter."
Let's just drop it.