I see your point, but after having coded a full (minor) project in Go, i can assure you that those two points alone (cumbersome array data structure and lack of generic code) made me rethink twice about using this language for the common "web service for CRUD to DB" use.

Then i tried to see how did go data access layer libraries look and it finished to convince me not to use it unless performance and memory usage were a crucial matter.