Those who don't learn from history are doomed to repeat it.
Gilmore and Cooks were extremly positive moves, but the 49ers made moves too. Defensive Line is a strength for them, and a big part of their identity, but they still went out and added Hargrave, Ferrell, Gregory, and Young.
The Eagles had more draft capital and stole Swift for a 4th round pick. The Cowboys used next year's 4th round pick (Lance) and 5th round picks (Scott) on players who have not played a down this year. In fact, the Cowboys have received very little return this season from their 2023 draft class.
The Cowboys main teambuilding philosophy appears to be "everyone just play better" and maybe the team gets lucky and the 49ers/Eagles suffer some crucial injuries in the playoffs.
They are playing extremely well, especially Dak, CeeDee, Bland, and Parsons who are all playing at elite, All-Pro levels.
Imagine how good they can be with an aggressive and competent Front Office.