What do we mean by more suitable now? Is it a worker who assembles machinery? If yes, what is the technical content of the fitter?

In the factory before, it was often said, "Learn to be a good lathe worker in three years and a bad locksmith in eight years." This means that if you want to be an excellent fitter, you can't be an excellent fitter without long-term practice. What you said is true. When the locksmith first entered the factory, he practiced the basic skills of filing, chiseling and sawing, and he had to be able to grind the drill well. But these are the basic skills of a fitter. Practicing basic skills can benefit locksmith for life. As you said, a senior fitter can fit in no matter how substandard the parts are. But if the fitter doesn't have good basic skills, it can't be done. A good fitter should not only have good skills, but also have rich practical experience. Only in this way, when encountering various technical problems, can we do what others can't do, and only senior fitters can do it. Because of this, an excellent senior fitter, the boss gives him treatment that ordinary people can't get. The assembler you see is just one of many assemblers. The locksmith is a kind of work that looks simple but is not easy to do. When you get to the society and have more knowledge, your opinion will change.