
FYI, Bradie Tennell has excellent jump technique, so take a seat. Obviously, Michelle Kwan had superb technique as learned from Frank Carroll who learned from Maribel Vinson Owen. Why is it necessary to speak in superlatives and generalities and vast sweeping statements? Your trollish query is not apropos to very much, since the current OGM and OSM from Russia also have some jump technique issues that aren't being examined under a microscope because they are fast, determined rotators with political clout and favored buzz behind them. Zagitova is the better and more precise jumper than Medvedeva, but neither of them can jump high with huge ice coverage.
Osmond, the current OBM has speed, huge jumps with great ice coverage and decent technique, aside from her flutz and some inconsistencies with nerves which have often led to inconsistencies on jumping passes. Fortunately for Osmond, she's been coddled with mistakes, and she is seen as a well-rounded skater worthy of being championed. So all credit to her going for broke when it counted and for skating clean in the sp and nearly clean in the fp with speed, attack and confidence. Her slight step-out and flutz on that one jump in the fp did not faze her nor trip her up from skating cleanly and with spark throughout.
As far as U.S. ladies, just as with most skaters, there are things you can pick apart with everyone. Amber Glenn is a very good jumper and a well-rounded skater who struggles with managing competitive nerves. Karen jumps high but she has technique miscues and she struggles with managing her nerves as well as the height she gets on her jumps. We know about Mirai's trajectory -- she suffered from URs more because of nerves rather than a lack of good technique. But she overcame a lot working with Tom Z and she should be proud of making it back to the Olympics, landing a 3-axel and winning a bronze in the team event. Mariah Bell is a work in progress re improving her technique miscues, but she has wonderful potential, if she pulls everything together under Raf. What Mariah needs most of all is a killer instinct. Bradie has the Olympics experience under her belt, and we shall see how she's able to put things together at Worlds. Hopefully, she won't be skating last in the last group at Worlds!
Ever since figures were dropped in 1990, there are plenty of ladies from every country who have problems with clean edges and poor jump technique. As Patrick Chan has demonstrated, diligent practice with figures improves blade control, helps with speed, ice coverage and ideally with jump technique. Coach Dough Haw recently revealed on TSL, that Patrick's problems with 3-axels are mostly a result of his having difficulty learning 2-axels and getting the technique for the axel jump fully under his belt before having to move on to 3-axels. And then Patrick had too many coaches telling him different ways to fix the 3-axel which never worked out for him, e.g., in the way that Adam Rippon eventually mastered the 3-axel under Raf.
Therefore, as with most things in figure skating, everyone generally has room for improvement in some area. Right now it appears that fast rotations, nerves of steel and buzzworthy consistency are calling cards for the podium. And you are fortunate if you can get away with some jump issues that aren't looked at too closely e.g, Zag, Med, Satoko. Even Carolina, despite technical miscues, has been held up all season long on her ubiquitously overpraised 'artistic' brilliance.