In the US, most of the distance races you have to start on the beach and you have to finish on the beach. Often times two or more boats will finish neck and neck with each other and requiring a beach dolly to land would simply not be safely possible in some of the surf here.

As for modern racing cats not taking kindly to being run up on the sand at full speed... Just last month we had a carbon 20, f18's, a marstrom 20 and a bunch of older nacre 20's running up the beach.. Seemed to fare just fine.