Oh come on, those languages have been around for 20-30 years, Go has been around for 7 years and haven't seen anywhere near the push from Google that C# and Java had from Microsoft and Sun.
And it's not as if generics is off the table, personally I think they will arrive eventually, here's what Go lead Russ Cox said in January this year:
And it's not as if generics is off the table, personally I think they will arrive eventually, here's what Go lead Russ Cox said in January this year:
https://research.swtch.com/go2017#generics