I'm not convinced this change will work long-term for both Nam/Polina.
Polina Edmunds is a star, and Polina Edmunds' man could be a distraction. Only Polina Edmunds can block the spotlight on Polina Edmunds.
Are they even dating? Who cares? David is young and determined imo. Not everyone needs to go to Frank, Carlo (RIP), Tom Z, Brian etc. to get results. Just because Polina is a star doesn't mean David can't make other stars. Do we consider Linda Leaver a bad coach because Brian was her only elite student? If they are dating they are dating. They are young. They seem like very determined people who will not let distractions get in their way. Like you said Polina is a star even if it's only in her own mind, but you can dislike her but you can't deny her results. She makes it happen. lol. She is Polina. She has no distractions lol.