Looks cool, but disappointing it's written in Go. Go is fast, but not as fast as Rust or C. I'm sure with large streams, you probably can see the difference in time if it's written in Rust or Go.
"I have a <very large> YAML file, and it takes yq <some long time> to parse, whereas <some workflow I use written in rust/c> takes <much less time>".
"Go is slower than Rust, the author should have written it in that".
It's likely for most YAML documents you encounter, the difference between using Go and using Rust or C is negligible. -- Though, if this isn't true, some numbers would be useful, too.
A comment like "Go is a bad language to use" is just a thought; but it's also a low-effort dismissal of something someone has put effort into, and of a tool that's quite useful.