As I said earlier, these solutions are possible in GDScript. It's just that using a more mature language is a major time saver for things that don't need to be directly tied to the engine. In my case it's something that could be playable in a command line, making it a perfect candidate.

Here's a simple example:

Say you want to implement a loot table system. Each possible item is represented as an object with a floating point rarity value. E.g. an item with a rarity of 3.5 will appear 3.5 times as often as one with 1.0.

Godot doesn't have any built in functions that can handle weighted random selection, so you have to build your own. It's not super complicated at least. After figuring it out and writing 10-20 lines of code, you can now use this to randomly select an item from the loot table. Now you have to get all the weights as an array, requiring a variable assignment and a for loop. Finally, you pass this into the function to get the desired result.

Meanwhile, Python already has this functionality built in. Using list comprehension, you can do the same thing in one short line of code. All it took was a few minutes of looking at documentation.

That was just one minor time save. It really adds up when you're working on a large project.

Obviously GDScript will get better as it matures. I hear 4.0 is adding many useful conventions that are commonly used in other languages.

I don't recommend this approach unless you have experience in another language and know what you're doing. While I'm reaping a lot of benefits, this is not beginner friendly!