West coast uses 2cm. Only East coast uses 3cm. A wholesaler would have to order in non stocked material at extra cost. Most customers don’t want to pay double for the same stone. Nothing wrong with 2cm.

There is no "trouble with undermount sinks" in quartz. That guy doesn't know what he's talking about.

I'm in the midwest. My countertops came 3cm - I didn't even think about it because that was what was on the display. - then my neighbor got hers and they are 2cm. We actually paid similar price.

I am in Indiana and our quartz is 3cm. I have an undermount sink.