Just because the APIs remain largely backwards compatible does not mean that they didn't change. Just the fact that querySelector and querySelectorAll was introduced and started actually being usable across all the major browsers is a huge change IMHO.
They really haven't.
> Yes, the same approaches are still supported, but there have been many additions and modifications to core APIs.
Once again, there really haven't been.
Yes, there are many more APIs in general (audio, touch etc.), but on the whole it's the same old cumbersome poorly designed 90s-Java-style DOM API.