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In the same sense that developing slightly better buildings shouldn't mean tearing down old ones.

Old building decay over time. A lot of COBOL still runs fine decades later.

Anyone involved in a major refactor knows it is a minefield. It should only be done as part of a strategic upgrade, not because Rust is "better" than C++.

Old doesn't mean unmaintained, old buildings have run longer than COBOL has existed. Tearing down an old building just because a new building is objectively better can still be seen as a shameful waste, and although I don't know much about construction, I'm sure tearing down and rebuilding is also a minefield.

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