@rfisher From my point of view, the difference is this: US and Japanese skaters are learning quads and 3As entirely of their own volition, in a healthier manner, and train in a less pressured environment to do so. Mirai made the choice and worked her butt off to learn it. Alysa Liu is learning 3A and quads because once she learns something she wants to know what's next (and to be competitive), but it's her choice. Ting seems to be making the choice herself because she wants to be competitive. Rika Kihira wanted to learn the 3A and quads to better her own skating. Etc etc
And while I'm sure Eteri's girls
want to learn the quads and
want to be competitive - I'm not discounting that - it seems a lot of the choices in their training are less their own choice and less about what's best for them and their goals and more about what Eteri needs them to do to win: poor eating habits, over-training, starting to learn quads and 3As as young as 10ish, all of which are things that lead to injury, poor health, and short skating careers.
As far as I know Mirai, Ting, Alysa, and Rika all have healthy, well-balanced diets (lord knows Tom Z probably has a careful RD-concocted diet for perfect muscle-to-fat ratios to produce optimal jumping), and as far as we know are not being forced to overtrain or learn these jumps when they're that young. Alysa I think started learning too young, so I do have a big problem with that, but I do see (and hear) that she's being restricted on the hours and attempts she is allowed practice 3As and quads to hopefully cut down on the wear and tear. So, while I still don't necessarily approve of that, I think they're at least doing it in the healthiest way they can.
The other thing is this: Japanese and American skaters learning quads are generally older and more experienced. Idk about other posters, but I think it's a lot more impressive to see a full grown adult woman do a 3A or a quad than to see young kids that just whip around in the air easily. For an adult it requires a lot more power, skill, and technique. And I want to see those quads rewarded. I love Alysa as a person, but I don't think her quads (or the quads of Eteri's skaters) are nearly as pleasing or exciting to watch as Mirai, Tonya, or Midori Ito's 3As. There's something special about a skater who's a total package, and right now the race to quads and 3As favors kids who pretty much only have the jumps, which makes the sport less exciting for me. Kinda like when the men's quad race began after Vancouver.