BTW, whatever happened to some of the jumps from the 50's. 60's and 70's?
Are they just out of fashion or considered too easy? Delayed axles, walleys, half loops, one-foot axle....?
I think they had already gone out of fashion to a large degree because they were considered too easy.
Walleys and half loops are used as connecting moves. As I recall Sarah Hughes used both as isolated jumps.
These days we usually see half loops in jump sequences, e.g., triple toe-half loop-triple salchow. E.g., Joannie Rochette.
Nicole Bobek did a beautiful delayed axel in the televised performance of her program to "Sacrifice" on the 1995 COI tour. That's the only one I can really remember seeing from a post-figures-era skater, and it wasn't in competition.
One-foot axel would sometimes be used in combination with a triple salchow from the landing. It was kind of a signature move for Jill Trenary in the late 80s. Bobek and Krisztina Czako are the other ladies I can remember attempting that combination since then.
Delayed axels and one-foot axels are not worth doing under IJS because they count as a single axel and fill up a jump box.
A good delayed axel could merit +3 GOE, but given the low base value of a single axel and the low values of the GOEs for that element, it would still be worth more points for the skater just to land an adequate double axel.
1A+3S combo (using a one-foot axel) is unusual and wouldn't suffer from the sequence penalty that jump-half loop-3S combos would, but it's not worth much more than 3S+2T and harder to pull off successfully.
That could be another option, though, for a lady who wants to do seven triples and can't do a triple-triple combination. It would fill the requirement for "an axel-type jump" so they wouldn't have to limit triples to make room for double axel. However, someone how has a good one-foot axel-salchow combination probably also has a good double axel anyway.