Well, async/await and several other features were held up at stage1/2 for a long while. I found quite a few things very valuable far earlier on... async/await, object rest/spread, class (static) property syntax.

Now most of it is stage-3 or in-browser, so not a bad decision, but for a long time, you really wanted to be at stage-0/1 and deal with a bit of pain should things change.