I've had this a few times, most recently with "how do I add this data file to my binary". At least that one made it to master now, and will be in 1.16!
Another gripe is the lack of a proper parallel safe map (no, map[interface{}]interface{} like sync.Map is just not acceptable) which would be a godsend and should honestly just be the normal map implementation. Maybe eventually with generics... (This is more of a language gripe than a stdlib gripe, though, and I'm sure that once generics come out we'll see a sync.Map that doesn't use interface {})