Every model of every car company has lots of unique problems in very mundane areas where development has stagnated decades ago and most models of manufacturers

Every model of every car company has lots of unique problems in very mundane areas where development has stagnated decades ago and most models of manufacturers never experience any problems. This is mind boggling - the problem has been solved by the industry, yet it was chosen to be introduced to that model. The same exists with buildings. Door and window placement is messed up all the time, despite being a few millenia old art. It seems fields never really mature, they reach maybe some 90% level and can stay there at best. No problem is ever really solved. If you look away, it might actually get worse.