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.
Edit: I'm dead wrong. :)
Edit: I'm dead wrong. :)
A forward slip is absolutely required for a PPL checkride and has been for decades (if you'd like a source, see page 45 of the definitive FAA ACS: https://www.faa.gov/training_testing/testing/acs/media/priva...).
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.
[1][PDF] https://www.faa.gov/training_testing/testing/test_standards/...
https://www.faa.gov/documentLibrary/media/Advisory_Circular/...