Did a council job around 15 years ago . The spec was to leave a 3mm gap around all board joints on ceilings using scrim tape . Was on day work so didn’t mind . I can see the sense in it though. I see a lot of cracks in new ceilings and on mf ceilings too . I also remember using a knuaf ceiling board that had A beveld Edge on all 4 edges you just filled the edge with this special filler they designed and sanded it and filled screw heads job done and you don’t scrim them .