[JepZ]

The 3rd law is just wrong.

Yes, we spend more time on other sites and therefore, we are used to the UX patterns used on other sites, but that doesn't mean that all other pages are doing good.

Actually, we do not choose the sites we are on purely based on UX patterns. Instead we choose the sites by the service/functionality they are offering.

So assuming that other pages are doing good UX and inventing new patterns will irritate users might be a good advise for junior UX designers, but UX experts should always question the status quo and search for improvements. So defining it as a law to stick to the UX patterns of the majority of sites is just wrong.

[JepZ]

As the down voter did not care to leave a comment, I try to give an example:

For years we were seeing the burger icon (3 horizontal bars) as an icon for menus. It took quite a while until it became a well known standard to add some 'Menu' text next to it (as you can see it on the Laws of UX page).

So for years we had a pattern on most sites which was not optimal. Just using it because everybody else was using it, didn't solve the problem that a majority of users did not understand or knew the icon.