I kept that out because too many people are going to look at the software applicable stuff. Most people aren't doing full browser or kiosk applications.
It's only basic if you're already applying it. But it does go into one thing of importance I touched on: Fitts' isn't the only law. People want to take this and stretch it to absurdist extremes, mistaking a discussion of Fitts as the alpha and omega of all interaction design.
Again, a few web designers have encountered Fitts, parrot it on rare occasion ....then go off and do whatever they were doing before. For even the people who have heard the term, it's for idle cocktail party chat or to be tossed off in the presence of clients when trying to inflate the billable.
Okay, I'll bite. Here's the exception that makes the rule, where you can (reasonably) take Fitts to an extreme:
Slideshows. Just because a web designer can parrot the one line doesn't make them interaction designers. Memorization and Trivial Pursuit: Web Developer Edition is basic. Application isn't.