I think the strength of discipline is not necessarily by depth, but by which has the highest medal contender.
Not if you are talking solely about team event strategy. If you go by what would make the most sense for the team event absent any individual event consideration, it definitely would be the women splitting because of their depth.
Alysa came in first at worlds, with Isabeau fourth and Amber fifth (beaten only by Japanese skaters). There are two American women (Amber and Alysa) going to the GPF, and Isabeau is the first alternate and probably would have qualified if she had been assigned to any GP other than China (where she was beaten by three Japanese women). The only women with season's best scores above Amber, Alysa, and Isabeau are Japanese; any of these three Americans would have a very good chance of finishing no lower than second in the TE women's SP or FP. The women are the strongest case for splitting. No other discipline has as much likelihood of doing this well with splitting.
But, given the rules and the requirement of letting the skaters with the best chance of individually medaling choose to split, it's not that simple. Ilia has been dominant, and it would be shocking if he did not medal. He gets to choose.
C&B are not just multi-time World Champions, but won both their GPs this season. Even if this is not their best season and even if they are not gold medal favorites, they still have a very high chance of medaling. Yes, Alysa won Worlds, but not multiple Worlds, and the Japanese women are fierce, with several of them having higher season's best than her. Amber won the GP Final, but has never medaled at Worlds, and the Japanese women are fierce. Isabeau medaled at Worlds a couple of years ago, but she finished fourth the other two times she competed at words, and again the Japanese women are fierce. I do think that there is a decent chance of an American woman medaling at the Olympics, but not as high as C&B's chances.
It is a bummer that the American women as a whole have been doing so well but only one will get to be in the TE, while skaters who have not done as well will be in the TE. But, I get the logic.