Bruh... what the heck was that!?
Right away when the angel and witches were "explaining" their "reasons" on why Will and Lyra must separate and rewrite their own worlds, I sensed a lot of nonsense.
I agree %100 that the angles pretty much did not want anyone but themselves to travel the worlds and not the knife bearer. Despite the fact that Will had closed his portals, somehow the issue is that previous knife wielders have left their own portals open, (but I don't get why or how this is issue toward the angles, who admitted that they can close the portals all by themselves and could have been doing that all along anyway, but to do so the knife must be destroyed to make their jobs easier, which doesn't make sense).
Then again, wasn't this the knife bearer's entire POINT. To close the portals of the worlds, but the angles come out of nowhere and go "oh yeah, we could've been doing this all along, but...yeah. That knife's gotta go!"
The truth was that the blade itself was a threat to them and they wanted it out the picture.
So suddenly people who travel to other worlds cannot reside in those worlds, because they're daemons would get sick and die. Okay...somehow this is a rule that's never been mentioned before. And we have little to no evidence to support this being the case.
I can go on but all I've got to say is that this ending felt more like the angles who are in charge after Metatron's defeat are solidifying their own power in the new regime.