Okay, so there's definitely simplicity. I agree that this is in many ways a nice change from some of the more popular languages, which can get a bit complex and heavy, with a focus on features that are nice in isolation but add up to a surprisingly difficult architecture to comprehend at the global level. I just don't think Go gets the balance right.
There are some parts of the language that are such a joy to use – C interop is simple and elegant, the concurrency story is great, the standard library is great, and in contrast to some other people, I think the error handling is also a nice example of simple and effective design. The wider tooling system is decently usable (with the exception of gofmt, as mentioned in the article, which I think is the single best tool I've ever used in any language).
But "simplicity" in Go-land seems sometimes to be the enemy of expressiveness. The lack of abstractions over operations like filtering, mapping, or removing items from a collection is incredibly irritating for such a common operation – instead of immediately obvious actions, there are tedious manual loops where I end up having to read like 10 lines of code to figure out "oh this just removes something from a list". The use of zero values is a crime against nature. The type system is shameful in practice compared to other modern languages, with so much code just being "just slap an interface{} in there and we can all pretend this isn't a disaster waiting to happen". It feels like such a lost opportunity to exploit a richer type system to eliminate whole classes of common errors (which are predictably the ones I keep making in Go code.)
I guess it's frustrating that a language—which is relatively well-designed and intended to be simple—too often makes things more complicated overall by making fallible humans do things that computers are better and more reliable at. I'll keep using it, because it fills a really nice niche that no other language is quite suitable for. But I'll keep being a bit annoyed about it, too.
C interop in go is super slow: https://github.com/dyu/ffi-overhead