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Dynamic languages like python or JS might be faster to build, but they’re certainly not easier to maintain. The type system still exists, it just changes at runtime (JS) and exists purely in your head (both of them). The value of static analysis, like reading code, goes down significantly.

As codebases grow it only gets worse, as more of your mind is filled with building a mental model of the type system.

That’s why you end up seeing crazy defensive coding practices in these languages. In PHP, I often see isset and instanceof spammed everywhere because nobody can garauntee that thing X is actually X all the time.