I want to add something that almost every other product is made in China and shipped to world anyways. The difference must be the quality and of course the price/quality balance of a product, not that where it is manufactured. I own two brand new Hohners, Bravo and Amica (Chinese). I can explain at least about Hohner. Everyone knows many other brands listed here are bad in many ways. Hohner purchase the accordions from China and get them to Germany, later they quality control and do the tuning there. Then they put to sale... That difference people argue is not German good, Chinese bad argument. Its a light - heavy instrument argument actually. If you use lets say a 5 kg steel frame and wood reedblocks on a 60's instrument, you get a deeper and louder sound. If you use a 3 kg aluminum mixed etc. frame and quality plastic reedblock for example, you get a thinner sound. But what people miss here is you will have a lighter instrument. Maybe that benefits the tariffs and shipments first but you will get a longer practice and carry advantage. You know what I mean if you ever owned a 120 bass old accordion. Yes new one sound is not that great but people calls vertical electronic keyboard (Roland) an accordion in these days.
I believe that "Chinese is bad" is a trick and a reason to sell old accordions. But yes old ones sound better.