Provided those imports and exports meet all relevant Directives, regulations, etc.
Do you object to rules like that?
Irrelevant (although I don't, as it happens). My post was to counter your obfuscation, regarding the "freeness" of trade within the single market.
While it might be free-from-tariff to import or export such goods and services, it is not free-from-expense to ensure that they are able to be imported, or exported.
Home produced goods have to meet the same directives regulations, etc.
Why allow imports to be outside of those directives etc?
As above.