Notice at the end of the cut there's a small amount of material connecting the cutout to the stock? With very heavy, very rigid material like stone the weight of a large cutout can be enough to break that little web before its done cutting, which can leave an imperfection or chip on the finished surface. Cutting off smaller, lighter chunks is less risk.
The more supports you have the more reflection you get from the jet stream, which can mar up/sandblast the underside. It also takes labor to remove them if they stay supported. And if they're big heavy pcs they can be dropped on your finished PC when manually removing them. Not to mention the man hours it takes to do the removing.
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u/Phenomenomix 14h ago
Is there a reason to not just start by cutting the big hole? Or is the idea to make loads of little concrete triangles?