For anyone wanting to avoid keel bolts when purchasing a sailboat looking in the bilge of every boat is going to be a problem and a waste of time.

Knowing in advance what boats have bolt on keels narrows the search for a boat by giving the ability to eliminate those particular boats from the search in advance.

As ocean levels rise there will be more debris in the water. Debris that has the potential to knock the keel of of a boat. A keel that is manufactured as part of the hull with encapsulated ballast is a stronger keel. It eliminates a point of failure and required maintenance.