We are obviously discussing 4CCs in the Olympic year.
Except that it's hardly only the US that avoids sending it's top skaters to 4CCs in the Olympic year.
I already provided a list of the 4CCs eligible competitors who finished top 10 at the Olympics in each discipline every year since 4CCs started. It's a pretty healthy list.
Here are the Olympic medalists who ALSO competed in 4CCs the same year:
2006 - Belbin & Agosto
2010 - Mao Asada
2014 - Denis Ten
2018 - Shoma Uno
And here are the 4CCs-eligible Olympic medalists who passed on 4CCs the same year:
2002 - Timothy Goebel, Sarah Hughes, Michelle Kwan, Sale/Pelletier, Shen/Zhao
2006 - Jeffrey Buttle, Shizuka Arakawa, Sasha Cohen, Zhang/Zhang, Shen/Zhao
2010 - Evan Lysacek, Daisuke Takahashi, Kim Yuna, Joannie Rochette, Shen/Zhao, Pang/Tong, Virtue/Moir, Davis/White
2014 - Yuzuru Hanyu, Patrick Chan, Kim Yuna, Davis/White, Virtue/Moir
2018 - Yuzuru Hanyu, Kaetlyn Osmond, Sui/Han, Duhamel/Radford, Virtue/Moir, Shibutani/Shibutani
To further illustrate the point:
2002 - 5 of 5 Olympic medalists skipped 4CCs
2006 - 5 of 6 Olympic medalists skipped 4CCs
2010 - 8 of 9 Olympic medalists skipped 4CCs
2014 - 5 of 6 Olympic medalists skipped 4CCs
2018 - 6 of 7 Olympic medalists skipped 4CCs
Is it because of the travel? If that were the case, then why did the pattern continue in 2018 when 4CCs was in Taipei which is just a short 2.5 hour flight to Pyeongchang?
I don't know what the answer is but what I will say is that the 4CCs nations seem to have figured out what works for them with regards to this championship during an Olympic year. It DOES give their non-Olympic skaters a chance to compete at an ISU championship. For up-and-coming skaters, this is a valuable opportunity to earn WS points and set themselves up for future seasons. For skaters in the twilight of their careers, it gives them one last shot at glory. I highly doubt that those skaters are sad they didn't get to compete against