It's true, there can be many issues with lower level workers. But in skilled trades it is common to find people who have interesting quirks to their personality

It's true, there can be many issues with lower level workers. But in skilled trades it is common to find people who have interesting quirks to their personality, despite being very good at their job technically. I see this often in skilled machinists, welders, machine maintenance people, etc. Some people may call the quirks "unprofessional" but it can come with the territory. Quirks are fine as long as they aren't destructive to others or to the common goal. Sometimes it does make it a challenge though because there just aren't that many people out there with the necessary skill and experience, especially in more specialized areas, so you wind up having to choose between someone with a fantastic attitude but limited skill and a very skilled tradesperson that takes a little more hands-on management (in the sense that you have to help them develop more empathy, to not quarrel, to communicate better with colleagues, etc). It's definitely a fine line. Somebody with great skill can still cause too much havoc within a team and make it an undesirable place to work. You have to take action on that, because ultimately it needs to be a happy place to work. And it's not a pay issue either, we've hired people well into the six figure range who at the end of the day just couldn't develop functional relationships with others.