Everything but being easy to learn, and having low complexity. Don't get me wrong, rust is an amazing alternative for C++, but golang is not targeted at that problem space. It's aimed at highly concurrent networked applications with a high feature turnover and large teams with varying seniority. In those areas development speed is more important than execution speed, and I'd take a few GC pauses over fighting the borrow checker any day. Plus rust ist still lacking a good concurrency story, which is spot on for golang.