Most places have rinse buckets available. We have a camera bucket on the boat (I know RSS does as well) and really wouldn’t be surprised if lots of others do as well depending on boat style. We now have a flattop Newton that runs right up on the beach so there is plenty of room for it. But even colleagues that don’t have facilities at the dock. I do remember many years ago when we didn’t want anyone touching any of or gear or equipment and not trusting how often water was refreshed letting it all have a good rinse in a huge bathtub in the old Hyatt. Happy memories Thankfully I have learned a lot since those days!
I realize many offer some rinse buckets on boats, and some are quite small, that don't fit a DSLR housing & strobes combination. I also like to check my rig prior to jumping in. My issue with beach loading, as I get older trudging through the sand with my rig to get to the boat, dodging sunbathers, is something I'd rather not do. I do it when need arises, and I'm determined to get a night dive in, even if it means diving off the beach, but original question/statement includes the word lazy.