The problem with appliances is that it is very hard to predict how it will be used, misused, and abused during it's life. And since there are ancillary conditions present with some appliances, the potential hazard is that much greater.
The manufacturer of boat hoists or marina equipment, for example, have to meet very stringent design and operational requirements of the associated product standard. Most of the time, this will prevent shock and electrocution to those using this equipment without the need for GFCI protection. The problem is the user and the associated conditions at and around this type of equipment. This is where GFCI protection fills in the safety gap.
So dishwashers, vending machines, drinking fountains, high-pressure spray washers, tire inflation and automatic vacuum machines are other examples of equipment with rather robust and stringent product standards that cannot fully predict the user and conditions of use. However, the likelihood of misuse, abuse and poor conditions are much greater for these particular types of equipment then most others found in the home and office. This is where GFCI protection fills in the safety gap.