Unlike when Dynamis was the only NA data center available to all NA players, any server is now technically "accessible" even while congested. This has resulted in Aether reclaiming its status as the de facto party finder hub while Dynamis dies again and Primal/Crystal slowly dwindle back to their pre-7.0 state. Now that the PF hub is very difficult to access it somehow feels even more restrictive than when the only options were Dynamis and Materia, because at least everybody else was going there too.

However, the biggest issue with this system is that Aether cannot stay congested forever. The native population will slowly shrink while server transfer and character creation is unavailable. It could happen in 7.1, or it could take well over a year like with Balmung and Mateus but eventually enough existing players on Aether will have taken a break or quit the game that Square Enix will need to open access for new players. When that happens there will undoubtedly be a massive flood of raiders from Crystal, Primal, and Dynamis wanting to permanently secure access before the entire data center is inevitably congested again. So many raiders moving to Aether will make PF on other data centers worse than it was in Endwalker.

The Solution - Moving North American data centers to different regions within North America:

Over the past two years I've read many suggestions on how SE should fix the data center problem but the common theme with most of them seems to be imposing new restrictions on the player that make data center travel almost pointless. The best way to have players distributed across all servers is to make them feel rewarded if they comply rather than punished if they don't. Square Enix already does this by making transfers to new/preferred servers free as well as rewarding players with feathers to be exchanged for items in-game, but the rewards can be earned through other means and aren't worth leaving your home server for a potentially dead one. And now that data center travel is a thing it doesn't even incentivize playing on the server you transferred to anymore since you can immediately leave. A much better incentive would be low latency.