I'm a touch confused...are you saying that if everyone used the year-based nomenclature, the inconsistent support would go away? Today in 2017 I have some ES6/ES2015 features I can use as well as some ES7/ES2016 features, but there are also other ES6/ES2015 that I can't count on being supported, and quite a few ES7/ES2016 features I can't count on.

How are these problems alleviated if we change the name we use? Or have I totally misunderstood your point?

Side Note: I'm not a fan of using a year for the same reason we (i.e. most everyone) stopped using it for versioning - That previous iterations have been done on a yearly cycle does not mean that future iterations will follow that schedule. That, however, is a side argument that neither of us touched on.