Agree to that - my experience exactly. Very recent example. My father's using Skype to talk with family. They refreshed UI, he got new version installed and that was it. I've had to answer multiple questions what does this and that button do. "The same dad, it just looks a little bit different." What I got as an answer was "It's placed somewhere else. It is so confusing. Couldn't they just left everything were it's always been..." Thankfully I have remote access to his desktop so I can guide him around in situations like this.

And I am quite sure removing 'www' on the address bar's domains is as confusing.