So, why exactly does dns mode break internet connection? about gobuster

[firefart]

if you hammer the google dns with thousands of queries in short time, they might block your ip.
Also on unix it creates a lot of sockets and open files because of golangs dns implementation. You can try building with CGO_ENABLED=1 in your environment variables so the unix implementation will use the system dns settings

[677230756E64]

How much is too much for google in terms of queries? I used delay 100ms so 10 requests per second which doesn't seem that much to me.
Also regarding the second thing, the go-specific implementation, that's the answer? We wrote the tool in go but part of what the tool does, the language does badly so you the user will have to work around it?