"The Genode OS Framework is a tool kit for building highly secure special-purpose operating systems."
"Genode is based on a recursive system structure. Each program runs in a dedicated sandbox and gets granted only those access rights and resources that are needed for its specific purpose."
Learning the different approches taken by multiple programming languages is certainly useful. It may not be that much relevant which language it is unless you want a job specifically in that language.
I can't speak for Google but I guess it is more relevant how familiar you are with software development practices and general knowledge about architecture, design, testing, algorithms to name a few than a specific language.
First of all, you don't have to stay in the software domain if you don't want to. However, your concerns do not seems to be very specific to the software domain:
* Everyone can be a "software developer".
Everyone can also be a [whatever]. Why would you want to have a whole profession for yourself? If you don't have to prove yourself during the interview, you'll have to do it on the job. This is not going to be different somewhere else. In general, is better for you if your colleagues have to meet a minimum competency standard.
* You have to know _a lot_.
There is a lot and there is a lot that changes. There is also a lot that stays the same and a lot that you can transfer from an area to another. Once you are a good at design, architecture, Test Driven Development, Pair-Programming etc. you are not going to forget everything just because you have to use a new programming language.
After all it's "just" software.
How you solves the problem and write your code internally is going to influence how good it works (bugs, performance) and how fast you can change and improve it. People will care about that. Usually, you are going to work in a team and your colleagues will also care about your solutions.