My vanity top and my daughters vanity top are 3cm thick. I think that is more the norm than 2cm. I think they look fine.

Here's mine:

And hers

I have it too. 3cm is very common on the East coast. 2cm on the West coast.

I have 3 cm Ceasarstone and undercounted sinks in both the kitchen and bathroom. Looks great to me.

It's what we have on order for when the vanities get here in about 3 weeks. Our new sinks will be the rectangular variety which may give it a somewhat different look. Here's a 3 cm counter and rectangular sink combo from Houzz

[Traditional Bathroom Countertops[(https://www.houzz.com/products/traditional-vanity-tops-and-side-splashes-prbr1-br~t_486~s_2107) by Medina Kitchen & Bath Remodelers Cabinet-S-Top

Here's a picture of my installed kitchen sink.

Thank you all so very much. Your information and photos have been extremely helpful. I'm convinced the 3 cm will look great! Again, thank you all!