[josevalim]

No, this comes from interacting with the community, companies, and large projects throughout the years, followed by research, publishing of papers, and careful analysis on the costs and benefits of introducing said feature! Only then we added it.

[groundzeros2015]

I reflected more and I think I just prefer languages with a formal spec. The GitHub projects are just going to evolve over time to wherever the wind blows, while a spec captures a concerted effort to unify in time.