> Web developers could use tools like cssnext to automatically add all the goop without ever being distracted by it
Can't they do that now? What exactly would that proposal bring new?
> Less code needs to be reviewed, tested and maintained.
Now there's four, then would be five different browsers. Why does this reduce anybody's work?
> this is speculation not based on facts, but experience with software development in general.
I'd say that experience you refer to doesn't include the one described in: