Naive question but why not use GDscript? I haven't had any issues with it

I'll vibe code stuff in GDscript, and I guess I more or less understand some of it.

But C# is what I've used for over a decade. C# has vastly better IDE support. It's a more complete language.

Plus a lot of C# assets/libraries don't really have GDScript counterparts.

I'll add that C# have better performances than gdscript. It doesn't make a difference for most of the things you code in a game, but it comes in handy when needed.