In the context of the article, I think that can be attributed to age (go is older than rust, so trending towards the "brown field." See for example Scala, which is a little bit older, and ended up in both loved and hated lists. I'd speculate that Go will be in the same camp in 4 years or so based on polarized sentiment I've observed.

That being said, there may be something about strict/complicated languages like scala and haskell that tends to polarize developer sentiment. Rust seems like it could fall into that same pattern based on the "up front" work that it demands.