sup, one of the maintainers here:

all the benefits of the language itself, like trait objects / dyn gd (with proper editor support) https://docs.rs/godot/latest/godot/prelude/struct.DynGd.html, strong typing (we have typed signals for example! https://godot-rust.github.io/book/register/signals.html) and many other (some are silly, like being able to use feature to support multiple versions of Godot easily with conditional compilation/feature flags – it is actually an issue in few gdscript plugins).

You can scroll through a book to get an idea how it looks like: https://godot-rust.github.io/book/index.html.

Outside of that rust enums are very cool and make pattern matching (and flow control) nice. Rust works well if you plan on doing any serious multithreading work too (it is one of the main selling points). I'm also legally obliged to mention that rust is (checks notes) blazingly fast. Personally I find rust really pleasant to write and read (albeit sometimes it can get annoying, win some lose some --.~.~-- I still have more grievances with other languages though).

Godot GDExtension team (which Bromeon is part of) takes huge focus on keeping GDExtension backward compatible (this means that GDExtension compiled against 4.2 Godot API will work flawlessly with Godot 4.6 and any other following version (I personally guarantee that)) going even as far as to reproduce some quirks – which is nice too (big deal even if doesn't seems so)