Swingman wrote:

I think the "lip" is a matter of preference, which can be made into
anything you wish it to be ... and, in many cases, justification
for the label "less skilled" labor involved ... but not always.

Oh, I agree. Was being a bit flip. I should have just said that if
one WANTS the lip for whatever reason, then it could be chamfered to
aid sweeping out crumbs/spills/messes/whatever. Of course it adds to
production time, and more special handling of specific pieces.