The position held for many years by the language authors was[0]:
Generics may well be added at some point. We don't feel an
urgency for them, although we understand some programmers
do.
Generics are convenient but they come at a cost in
complexity in the type system and run-time. We haven't yet
found a design that gives value proportionate to the
complexity, although we continue to think about it.
Meanwhile, Go's built-in maps and slices, plus the ability
to use the empty interface to construct containers (with
explicit unboxing) mean in many cases it is possible to
write code that does what generics would enable, if less
smoothly.
Once the community could no longer be held back, the golang FAQ presented a very different position[1]:
The Go 1.18 release added type parameters to the language.
This permits a form of polymorphic or generic programming.
> Generics were always planned, of course ...
This is provably incorrect.
The position held for many years by the language authors was[0]:
Once the community could no longer be held back, the golang FAQ presented a very different position[1]: 0 - https://web.archive.org/web/20170102202940/http://golang.org...1 - https://go.dev/doc/faq#generics