Being able to explain a thing to someone non-technical is an important social requirement. If you have to explain a problem or project to a C-level and you go off the rails with technical stuff, or get deep in the weeds of some part of it, without being asked, youre going to get deer stares and no one in the room is going to understand you. Similarly, if you as an engineer, go too technical when explaining things to an admin or jr, then you are also going to get deer stares and no one is going to understand you, or they will get frustrated.

You can be a """"rockstar"""" engineer and still not be a good fit because you cant sanely explain something to someone not at your technical level.