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For the average career developer, less common than being stuck with the same legacy code base and language/framework for years.

Yep. A lot of the negative comments seem to come from people who haven’t worked on any new technology/language/framework in years.

Only within startups. Larger corporations have stable toolchains with lifetimes measured in years.

Based on my experience at a very large corporation, not the case. I've had to work on more languages within a year here than any other job I've had.