Whenever I've seen an explanation of UX (to differentiate it from UI), one classic example was Tesla's supercharger network.

We all remember Steve Balmer's comments about the iPhone when it was launched. That, without a physical keyboard, it wouldn't appeal to business users.

Yet, you can see the night and day difference between using the native keyboard and using a simulated one in games like Wordle. Whatever tricks they pulled to make the keyboard work like magic speak to the execution of the smartphone that Apple excelled at.

And that separated the iPhone from whatever came before it.