ChaCha20 may be better in the abstract, but as a practical matter AES-GCM can take advantage of AESNI. I don't think a patch adding support for ChaCha20 would

ChaCha20 may be better in the abstract, but as a practical matter AES-GCM can take advantage of AESNI. I don't think a patch adding support for ChaCha20 would be particularly controversial anyway.