The problem is those things can have an impact outside of national
borders.

Do you recall in the 80s, the Scandinavians getting arsey because the
acid rain destroying their forests mostly originated from the UK ?


If it crosses borders then standardisation is often sensible, if it
doesn't then there is no need.

On a very subtley different point, where does "standardisation" stop and
"regulation" begin. Once you start to "regulate" you are in the realms of
having to join the table to negotiate it, or be lumbered with the results
of other peoples deliberations.

Once you start with regulation you need inspectors and a whole host of
expensive administrators.
Empire building. More and more costs and uncompetitiveness.
Jobs for the boys.