As a kid, I used to play lots of videogames, and I hated playing in beginner mode. It made me feel weak and ashamed of my lack of ability.
Beginner mode, after all, is for beginners. And I don't want to be seen as a beginner.
Funny how now I think the precise opposite. Beginner mode is nothing but a reassurance you're trying something new, and want to know the basics so you can evolve. It's not a sign of weakness, it's a sign of broadening your range of activities. It means you're learning.
It most definitely is not a static mode. That's why there are more advanced modes, so you can challenge yourself to progress and evolve.
It's really ok if you want to be seen as an expert; in fact, it's a good sign if you're seen as one.
Just don't panic when suddenly someone who never stopped training and relentlessly playing in beginner mode happens to skyrocket past you.