We already have languages that ship features. Go is a lone lighthouse of stability in a sea of fancy languages. I'll play with your fancy languages, but I build my own projects that I actually use in Go because I can trust that it will keep working for a long time and if/when I need to go back to it to fix something in a couple of years I don't need to re-learn a bunch of crap that might have seeped through dependencies or the stdlib.