Our kitchen renovation is nearly complete, but I have a question about how our undermount sink (with a negative reveal) was installed. I saw the countertop guys put silicone caulk on top of the sink and then set the countertop down on top of it, but they did not put an additional bead of caulk around the edge afterwards.

I asked our kitchen designer, who replied that this was typical, and that they don't recommend an additional bead around the edge because it shrinks and gets moldy.

However, it seems like not having the bead of caulking there just means that the mold will grow between the countertop and sink where I can't reach it to clean it.

Should I insist it be caulked, or is it not a concern?