You often have to learn this stuff outside of your regular job. Once you know another stack then you can find another job using it. That's how you exert control

You often have to learn this stuff outside of your regular job. Once you know another stack then you can find another job using it. That's how you exert control over your career. Tying yourself to one company (or stack) is a slow death sentence. EDIT: to those downvoting this... Do you disagree with me (i.e. you think it's a good career decision to stick with a single tech stack) or do you agree but dislike that it has to be this way? Genuinely curious because I didn't think what I said was controversial at all, just industry observation/common sense.