It doesn't matter what ARIA Authoring Practices says. If you implement patterns that suppress tab interaction in favour of binding arrow keys (for tabs, menus, etc) your users will be confused and blocked.
There are two ways you can make websites less accessible with ARIA:
1. Using ARIA incorrectly
2. Using ARIA correctly
EDIT: I'm speaking in the general case, and in defense of casual users. In short: don't use tabs etc when you can use simpler patterns like same-page links.