I might agree in theory. In practice, this is just a call for a minor nerf to CAS.
And while CAS might not need the cores, does it really need a nerf?
The cores serve their intended purpose - to encourage CAS to take territories in their historical area of interest. The cries of "railroading" get a bit shrill and knee-jerk, sometimes.
It ain't broke, so don't "fix" it. Far more likely that the "fix" would break something.
From a Doylist perspective, that's fine. But die-hard Doylism doesn't really work in a game that is about history. The apparent fact of the matter is that these cores are ahistorical representations of what was going on at the time.
If you want to be a die-hard Doylist, riddle me this: did Manchu or Muscovy or Aceh need a nerf? Did Taungu need a buff?
...Did the Ottoman dynasty need to be renamed from Osmanli to Osmanoglu?