My 1974 Schwinn Paramount was very well done. My California painted Masi awesome. My 80's Cinelli is well done. My 80's Pinarello's and Bottecchia are very well done. The last of my Colnago's are well done. The early Colnago's I owned had poor paint work and cheap decals. The early Bottechia's were sloppy. The early Cinelli's were sloppy.
They all learned...eventually.
Even the last of the real Raleighs were decently done.
But, from the bike boom into the 80's there was a lot of schlock on the market. I think we bought the Italian stuff for its geometry and ride. And for the better Italian components that came with a lot of it. The French stuff was a bargain and usually light weight. My Peugeot 1973 Py-10 had a horrible paint job.
One of the weird things about the early days of the 1970's bike boom years was that the American makers had been selling **** bikes with really nice paint jobs. For decades! Over-built tanks, including their racing style bikes, with cheap components slapped onto a nice paint job.
Yeah, the Japs did a good job of detailing for the most part. But they kind of share the same story as the Euro's...the did learn more quickly though! Some of those early SOMA's, Nishiki's (American company, Jap production), Panasonic's, Kabuki's, etc. were pretty rough. The early Fuji's weren't much better. A friend had either The Finest or The Newest model and it rusted through the paint just looking at it. The later production of their steel stuff was really good.
Now, everyone has their frames manufactured, painted and decaled in China and most of the results are outstanding. A few of the Italian, French, English and American firms also seem to turn out great paint jobs. Allied bikes might be gaudy, but I like them...
https://alliedcycleworks.com/two-new-chrome-paint-colors-for-valentines-day/