As someone who appreciates emulator development projects, I'd like to offer some perspective:

Several aspects make every new GB emulator implementation valuable to the community.

Some technical challenges in emulation are approached differently by each developer.

Handling edge cases and accuracy testing requires significant effort beyond basic functionality.

Often the learning process and personal growth are the primary goals, not just the end product.

Languages like Rust bring modern benefits like memory safety and performance to classic emulation.

Emulator development teaches low-level hardware concepts in an engaging, practical way.

A GB emulator is definitely not a weekend project if your goal is any kind of accuracy. And even if it was, that doesn't devalue the project or effort that went into it.