It may not sound like a satisfying answer, but: because I'm not here to earn a language certificate but rather to live and work, my German is more than fine, and I think my time could be better employed doing something else.

I've worked in German institutions for a long time now, I've published in German, I have no problems understanding people and, leaving my accent aside, people can understand me. I read books in German and understand German movies. My German is fine.

I could take time away from learning what's new in tech and science (a lot, apparently) to get a C2 but, and I may be wrong here, I don't think someone asking for "minimum C2" (which, again, disqualifies even native Germans) is engaging with the process in good faith.

I have no objections to learning the language, which is why I've done it. What I do object to is chasing a pointless certificate when I could be doing the thing I was brought here to do.