A quick guide to the generics support that's been added to Go: https://bitfieldconsulting.com/golang/generics

Specifically, Golang 2.0 was reserved for backwards incompatible changes, generally understood to be of some significant size, not twiddly bits like this that are adequately covered by a go.mod flag. Generics was thought to possibly involve backwards incompatible changes, but it was done without backwards incompatibility. There aren't any similarly-sized issues on the horizon right now that would result in a 2.0.

If you track the issues closely on GitHub, there's a constant low-level discussion going on about it, but so far nothing seems to be both important enough and large enough to justify the version change, like, not even close.