I haven't found this to be the case. At 3 different rinks in 3 different states, all the coaches I've worked with have done waltz, half-flip, and half-lutz. We also do half-loop (which is a full rotation jump) and 'half of a loop' (which is a loop landed forward). I've even worked with a coach who encourages skaters to start by landing axels facing forward.
USFS has waltz, half-flip, and half-lutz in their freeskate learn to skate curriculum:
http://www.usfsa.org/Content/FreeSkateCurriculum.pdf
It would be silly to not teach these jumps, as you said- they are very useful in footwork, and except for the forward landed axel (I disagree with that practice) they are very good building blocks for the jumps.