Same issues as always for many American teams : issues on throws and SBS jumps.
Same issues as always for many pairs teams across the board, not just U.S. pairs skaters. Alisa Efimova is Finnish-Russian and she learned to skate in Russia, where pairs skaters are known to be solid technicians, but few teams are completely infallible when it comes to sbs jumps. Alisa should seemingly have better technique, but she clearly opens up too much in the air, which makes it difficult to complete three rotations. Alisa has excellent consistency on throws. Even top pairs like Miura/ Kihara can and have made errors on throws and sbs jumps. Deanna and Max have struggled with sbs jumps, too. Laurin / Ethier are not rock solid. Problems with jumps and throws have creeped in at inopportune moments for Lia/ Trennt, too. Even Metelkina/ Berulava have occasionally been inconsistent with the jump elements. The Hungarian team, Pavlova/ Sviatchenko are probably the best technicians, but they have made rare jump mistakes, too. All pairs teams have weaknesses to overcome.
Yes, the sbs jumps often are an issue for Val Plazas, and a few other U.S. ladies. Emily Chan has trouble with her ankles, but she and Spencer skated a clean sp recently with a 71+ score. Alexa Knierim was good with jumps and throws, so was Chris until he got injured. Alexa and Brandon were wonderful with jumps, throws, and all pairs elements. Brandon & Haven were good, too, until Haven's knee injury. Jess Calalang & Brian Johnson had problems with sbs jumps, but they did skate some clean programs, and they were world class on everything else, especially their effortless triple twist. Chelsea Liu has had jump landing difficulties due to her long legs, but with her new partner, Bedard, she has been notching some clean programs. McBeath/ Parkman are very strong with jumps and throws. But it's not like strong teams never make mistakes. Ashley & Timothy were also very good with jumps and throws, as were Tarah & Danny.
Danny is now with Ellie Kam, and they are one of the best pairs teams in the world in terms of smooth, expressive movement quality, world class lifts, 3-twists, and death spirals. Ellie was new to learning triple jump elements for pairs when she partnered with Danny, so she had to learn under pressure and a huge microscope. She has mastered the triple salchow sbs jumps, and she is beginning to figure out throw landings with K/O having recently won the bronze medal over Lia/ Trennt at Skate Canada.
As well, two U.S. pairs teams hold World records for throws: Inoue/ Baldwin, first throw triple axel in competition (2006) performed clean on multiple occasions; Vise/Trent, first throw quad salchow in competition (2007 GP France).
Jean-Luc Baker was even questioned during a practice at SkAm regarding why U.S. pairs had issues, as if all pairs teams around the world don't have issues. He answered that pairs is a tough discipline, and that some teams in other countries (Russia, China, perhaps even Japan and South Korea) receive a lot of financial assistance from their gov'ts to focus on training. It is harder for skaters who have to work to pay for their training and thus have less time to focus exclusively on training. I would also say the lack of plentiful competitive opportunities makes it difficult to improve weaknesses, coupled with some skaters not having the best coaches. Historically, U.S. fed has paid more attention to developing singles skaters.
Ice dance in the U.S. became a dominant strength in large part due to Russian ice dance coaches emigrating to the U.S. and teaching a generation of young skaters. The same scenario did not happen for pairs skating in the U.S. Albeit, that there are some good pairs coaches in the U.S., but not to the prominent degree as there has been re the famous ice dance training centers in the U.S. and Canada.
In any case, even the ISU gives pairs skating short shrift. The best pairs training has been at centers in Europe, with huge influence from Russian coaches. Everybody wants to train with Dmitri Savin these days. Previously, it was Nina Mozer. Bruno Marcotte has had a modicum of influence, too, but Nagaoka/ Moriguchi recently left Marcotte for Savin.