As said above, "reality" level dismantle is just "stronger" than regular dismantle when it comes to Gojo's limitless specific CT.
Otherwise, it wont change anything for any other sorcerers/cursed spirits, be it instantaneous or not.
Unless one has the 6th eye and a teleportation ability like Goj0, regular dismantle still is invisible and way too fast to be dodged anyway (at close-medium distance at least).
Now the "world target" stuff is a misconception imo. Sukuna didn't cut the world lol, just the absolute space (reality) Goj0 was in.
Let's say that Satoru's neutral limitless allows him to bind/curve spacetime by manipulating its relativistic proporties, Sukuna's "advanced" dismantle could just operates at a more fundamental level at which relativity doesn't apply anymore, allowing him to bypass/ignore limitless' curvatures.
In other words and to put it simply, let's imagine that space is like a sort of fabric/fishnet, while regular dismantle would foolow its curves, the advanced version would just pass through its mesh: