We have a Corning counter & sink. The sink has a large crack,
the result of a poorly insulated window, cold air + hot water. We were considering having the existing corning sink cut out, replaced with a stainless steel sink insert, with its edges on top of the counter.

However, a reputable home renovator informed us that the whole counter needs to be replaced. Has anyone had similar experiences with our preferred solution: replace with a stainless steel sink insert, not the whole counter?
Thank you in advance.