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>I don't find the scripting language any worse or better than any modern script languages. What are the missing features?

lambdas, closures, support for error handling, constructor overloading, list comprehension, packing/unpacking (arguments/lists), varargs

I guess most of these are syntax sugar or quality of life stuff.

Gdscript is a lightweight language, it wants to be fast. They explain the goal of the language in their doc and why they didn't use something else.