It was introduced only 90 years ago (1916). As an aside, public street lighting was introduced in 1807.
BST was permanently in force from 1940 to 1945, and again in 1968 to 1971. We had double BST in 1941 to 1947.
It's not like these ideas are new. They've been tried before, and we've
always changed back again. Does that not suggest that the system we
currently have was thought to be the best, all things considered?