It’s unfortunate that llama.cpp’s code is a mess. It’s impossible to make any meaningful contributions to it.

I'm the first to admit I'm not a heavy C++ user, so I'm not a great judge of the quality looking at the code itself ... but ggml-org has 400 contributors on ggml, 1200 on llama.cpp and has kept pace with ~all major innovations in transformers over the last year and change. Clearly some people can and do make meaningful contributions.