Yep I also disagree. I would say I have a mastery of a lot of backend programming, architecture/infra deployment, microcontroller programming, assembly, React +

Yep I also disagree. I would say I have a mastery of a lot of backend programming, architecture/infra deployment, microcontroller programming, assembly, React + Redux, and at least 3 or 4 other languages I’ve worked in through my career. I’ve had jobs doing data engineering - building and deploying machine learning models at scale, advanced computer vision stuff (before ML became the rage for it), building, designing, and deploying tiny sensors on wind tunnel models, etc etc. I have a couple of open source multiplayer projects with a few thousand MAU each. Now, the one thing I will never master or care to is CSS - the devil himself must have come up with this abomination.