Pretty sure #1 isn't accurate. I wasn't required to forward slip (or side slip, for that matter) on my FAA checkride nor have I been required to do so during any biennial flight review.
However, transport category aircraft (among other issues) have swept wings, which are far less stable in a slip - so slips are neither taught nor recommended for jets.
Huh. I'm wrong then obviously. Wonder if it's never come up as I tend to forward slip on crosswind landings. Don't recall a DPE ever even mentioning slips.
Edit: I'm dead wrong. :)