Shipping is a service....
Well...if you think so....I thought more along these lines:
.... is mostly concentrated in financial services, hospitality, retail, health, human services, information technology and education.
As for shipping you need to have (and to maintain) lotsa ships, which is expensive...which is more than jungling numbers on a computer in a bank! :)
And... it has transfers which Germany has specifically fought against...
...which we wouldn't and couldn't fight anymore if we had a real union! :)
(The same way rich California can't fight transfers to potatoe-land Iowa)
The EU as a single real union is kind of a non-starter because of entrenched cultural and language differences...
Well...the US didn't start out any better....the differences between the settlers had been as strong as at home....different languages, religions and cultures...there had been lots of hostilities and even wars....to grow to Americans needed lotsa time!
Even today, the Latinos and other minorities are growing and with them their cultures and languages....still....they want to be (mainly) Americans!
Shipping is a service.... as is tourism (the only part of their economy that had been working and now that's dead...)
And you can't blame that on the Germans....which have always been loyal tourists, loving spending their holiday-money in Greece. The country would be a lot worse off without it's german tourists!
Likewise the shipping...exporting Germany has no own merchant fleet to speak of and was always a bonafide customer of the greek shipping...no rivalries here!
Btw....it's not dead...it's alive and kicking:
Greece leads global merchant fleet
....In the report, UGS notes that Greece remains in the leading position during 2018, as it controls 20% of the global fleet in dwt tonnage.