I'm not sure if fearing being a newb is the reason. I've noticed that there is a lot of wheel reinvention in tech and sometimes we even go backwards collectively like Spectre and Meltdown. The old hands understand the cycles better.
Re employment: I think if you are a programmer then you will never be out of a job, especially in the coming automation apocalypse. There are still systems at the IRS running on assembly and cobol. C will be with us for the foreseeable future. Learning new things is cool but it is also fine to double down on what you are strong at and not worry so much about missing out.
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