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If JITs hadn't been invented you would be completely right but JITs have been invented.

There are deeper optimizations that JITs can do such as knowing at runtime that the value of a variable is always 2 that typing information simply can't express.

Duck typed Python is optimal for development speeds, the only thing that matters in startup environments. It has it's niche.

You aren't gradually improving, you are gradually deteriorating the codebase to make it look more familar to you.