[acroback]

It is trivial to write both of these on your own, why do we need unnecessary abstraction for such a simple task.

[millstone]

Sorting, appending to a slice, or removing from the middle of a slice are all awkward and bad in Go.

[kccqzy]

That's the ethos of Go. The standard library can be poor and woefully incomplete because hey it's easy to reinvent the wheel. And then instead of composing functions (say, a reduce function applied to max to find the max of a sequence), users just end up rewriting everything because it's trivial.