^^ All I can say is that difficulty is relative, if you cannot do a 3LZ-3T with Yuna's quality. it is a difficult element for you.
Recently, Gracie's 3LZ-3T is huge in size and perfect outside edge but lacks flow, finesse and consistency.
Pogo's toe-pick technique is iffy and pre-rotates.
Liza still needs to put her 3lz-3T in competition. her jumps is explosive with flow/snap and beautiful trajectory like Yuna's. but her launch is a little different(you can watch her outside edge/toe pick in slow-mo and compare to Yuna's).
Liza and SoYoun's jump are the closest to Yuna's among current ladies. but SoYoun still don't have a consistent 3lz.
I wish Liza can do a 3A in future. her 3A in practice looked very good.
One thing I am glad to see is that now members on this board started to use the words, Yuna fans used to describe Yuna's skating, such as jump to the music/with the phrasing of music etc. Glad, current promising lady skaters are doing well and channeling certain quality of Yuna's skating.

as for ATS, i have no idea, I guess, Liza will be popular in Korea, because, Korean fans love skaters with beautiful jumps (the reason why Han got invited last year), but it is very likely Liza will be invited in the future.

and remember, Liza and Yuna shared podium at last year's GoldenSpin, both of them wearing black. very cool.
I have hopes on junior skaters to show strong 3LZ-3T in the future, Wakaba and Karen, perhaps
