I have to commend Microsofts 'if it ain't broke' approach. No need to mess around with a new UI when the old one has been tested and curated over months (meaning everyone knows exactly where everything is). No silly gimmicks on the controller- just make minor improvements on a stellar design.
I still think the UI on the 360 just prior to the new xbox experience (that was released almost 12 years today!) was the best.smart, snappy, fast to cycle through....*chefs kiss*. I've found the Xbox UI laggy or harder to find exactly what I'm after (eg: digging through more menus) ever since.