I think with Ashley and Gracie the US ladies were much more competitive than the men during this period until Nathan came along.
It depended. Just like Nathan skewing the results, Ashley/Gracie (for about four-five seasons) skewed the results too. I'm just gonna go by Worlds unless otherwise indicated:
In 2011, the men placed in the low top ten or past ten in the upper teens. For ladies, outside of Czisny's 5th place finish, Rachel Flatt (who was injured) placed 12th.
In 2012, Jeremy Abbott placed 8th while Adam placed 13th. Ashley got a great 4th place finish, but Czisny....I'd also argue look at the level of competition the men had v. the women.
In 2013, Max Aaron placed close to where Ashley and Gracie did.
In 2014, at the Olympics, the ladies were better. 4, 7, and 9th vs. 9th and 12th. At Worlds, Abbott matched Gold's placement at Worlds and Max Aaron placed 8th. Ashley placed 7th and Polina placed 8th.
In 2015, Gold was 4th and Wagner 5th and Polina 8th at Worlds (Polina did win 4CC). The men weren't so far behind with Jason in 4th, Adam in 8th, and Farris in 11th. I wouldn't say the ladies totally blew the men away here.
In 2016, Ashley got the silver while Gold was first in the SP but missed out on a medal in the LP to place 4th. The men weren't close to medaling, so clearly the ladies were stronger BUT Adam placed 6th (not too far off from Gracie's 4th), Max was 8th and Grant was 10th. Mirai, in comparison, was 10th.
At 2017 Worlds, the men placed 6th and 7th compared to the ladies who placed, 4th, 7th, and 12th.
At the 2018 Olympics, the men placed 5th, 6th, and 10th. The Ladies placed, 9th, 10th, and 11th. At Worlds, Nathan won, Vincent went from 3rd in the SP to bombing the LP to place 14th while Max Aaron placed 11th. The ladies placed 6th, 10th, and 12th. I guess at this Worlds you can say Nathan skewed the results, but hey Vincent could have medaled as he would at...
The 2019 Worlds while Nathan won and Jason placed 9th. Ladies were 7th and 9th.
ETA: For Four Continents, from 2011-2020, both ladies and men had 7 medalists from 2011 to 2020. Two champions in ladies, Ashley (2012) and Polina (2015) and one champion in Men: Nathan Chen (2017) (Adam did win in 2010). Two silver medalists in Men: Joshua Farris (2015) and Jason Brown (2020) and one silver medalist in Ladies: Mirai Nagasu in 2016. And four bronze medalists Mirai Nagasu (2011), Caroline Zhang (2012), Mirai Nagasu (2017), and Bradie Tennell (2020) while the men also had four bronze medalists: Jeremy Abbott (2011), Ross Miner (2012), Jason Brown (2018), and Vincent Zhou (2019). Six different men won seven medals while five different women won seven medals in that ten season period.
So from 2012-2016, Ashley "skewed the results" with Gracie helping around 2013-2016. Even with their skewing, they weren't that far head of the men most of the time except at the 2014 Olympics and 2016 Worlds and even then, the men had more variety of competitors where the ladies were carried by Ashley/Gracie, just like you're saying Nathan is carrying the men now.
I'd argue now, the men are stronger because outside of Nathan, we have two competitors who are favorites to make the Olympic team who have either a shot at a medal or can place comfortably in the top ten.