Honestly, I think that there may be a very legitimate argument that given that Romania and Bulgaria joined – and this becomes even more-significant with a Ukrainian membership – that the scope of Article 6 should be extended to the Black Sea, as we did with Turkey when Turkey joined. Otherwise, it’s possible for Russia to perform a blockade on NATO Black Sea powers and sink their warships without them being able to avail themselves of NATO Article 5 protection.
Broadly speaking you aren’t wrong but ATM russian navy is unable to blockade even the civilian shipping of a country that has no navy. There is probably no need to resolve this issue now, especially as the Black sea countries are bound by the previous treaties on Black Sea like the Montreux convention. Moscow might be more amenable to changes of these treaties if NATO doesn’t let them win in Ukraine.
That’s bad!