Charisma is a valuable skill as a software engineer. Have you ever needed to convince another team to implement a feature for you? Charisma helps greatly with that.
Have you ever convinced someone to do something which turned out to be a bad idea? Charisma is a social amplifier. If what it is amplifying isn't good enough, more charisma only hurts instead of helping.
Essentially, you need just enough charisma to avoid being steamrolled by others when you're right and they are not, while not having enough to steamroll them when it's the other way around.
Essentially, you need just enough charisma to avoid being steamrolled by others when you're right and they are not, while not having enough to steamroll them when it's the other way around.