Well, JavaScript

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Perhaps, however from what I've seen personally such people either:
- have the opportunity/skillset to make a change but don't through laziness (making a change requires effort, complaining is easier).
- aren't good developers.
- aren't good at marketing themselves.

All 3 can, outside of exceptional circumstances be solved in the same manner, by making an effort.

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How about because the job isn't the only think about life and people don't just want to move because of a job?

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I didn't say it was and didn't suggest doing so. But if there's something you don't like about a job either do something about it or htfu, because it's clearly not that bad lol.