Well said Arthur.
For most of us the BSS, like insurance, is just a piece of paper we have to have, simply to get a license. I suspect the number of people badly injured or killed by boats with a current but invalid BSS made invalid by changes since the last BSS inspection is vanishingly small. Zero in fact, I wouldn't mind betting.
Its a non-problem made up by bureaucrats whose raison d'être is to make up rules for others to follow at no cost to themselves.