That is an unduly pessimistic view of Polina's future, to say the least. Polina's 3Lz3T in the LP scored 10.80 points. I believe that is the highest score awarded to any one element in the entire ladies' competition. Her 3F1Lo3S scored 9.50 points, even with a ! call. Any skater would be lucky to have that to build on. What hurt Polina on the TES was the <s and a slew of negative GOEs, especially on her 2A. I see no reason to assume she can't improve in these areas, if she works at it.
I suspect that what hurts Polina's PCS most is her inability to maintain her speed throughout the program. When the pressure is on she seems to slow down and really draw out the approach to her jumps. Also, Polina's LP is intricate and nuanced. I love the program; it's my favorite ladies' LP of the season. But it's more challenging to keep the speed up in an intricate program than in a more conventional one. However, Polina isn't an innately slow skater. She isn't fast, but she can move at a respectable speed. She just needs to do it throughout her performance.
Polina is tall for a skater and that does present challenges. Tall skaters generally take longer to get their full growth and longer to get their bodies under control. The up side is if a tall skater can hang in there and get everything together, they tend to look more impressive and commanding on the ice than their smaller competitors. What Polina needs right now is persistence and time to season.
Miyahara is another skater who needs to simmer for a while. Her fans tend to talk as though she's already there, when she's really just starting. Over-hyping her isn't doing her any favors. That's too much pressure to dump on those tiny shoulders.
For those who are upset that Gracie won with a flawed skate, let me point out that whoever got the gold at this competition would have won with a flawed skate. All the ladies in contention for the top spot had mistakes in their programs. They were all under a lot of pressure. Leonova needed to impress the folks back home to bolster her chances in the extremely competitive Russian ladies field. Gold, Murakami and Miyahara also had to worry about competition at home, as well as snagging a GPF spot.