Some think that the universe is infinite. To convince one in the creditability of the idea they point mainly at our inability to conceive of its spatial limits. Hence, here, I use 'infinity' (of the universe) just the same way--namely, no finite number can measure it.
Imagine they are correct. Infinity of anything means that it will have both infinite spatial parts being at finite distance and infinite ones removed infinitely from one another. If so, and given the limited speed of the interaction between the objects (parts) of the universe, there would be infinite parts of the universe infinitely isolated from one another; they would 'never' interact with one another. In that case, the universe might cease to maintain its unity and thus, to hold universal laws, physics claims to study.
So, can the universe be infinite or in other words, can the idea of our inability to imagine the universe's spatial limits be viewed as a counterbalance to that of the unity (universal laws) of the universe?