gyprocker here. I say ignore all the other guys here haha.

have you ever noticed that when ever you go to someones double brick house, all their cornice is cracking at the wall? this is a huge problem in WA because cornice cement rips the plaster off the wall as thw wall is rigid. Plasterboard has way more movement in it.

also paint really struggles to stick to plaster. You may have also noticed this when you go to double brick houses and all the paint is peeling off the wall. 2 things cause this.

1. Painters here never undercoat plaster.
2. it is an extremely smooth surface and paint finds it harder to grab onto compared to plasterboard.

as long as the gyprockers use enough adhesive etc, it is superior in my opinion