The most compelling argument I can give for splitting is that it introduces a very obvious hierarchical structuring. Our brains are much better at working with relatively small numbers of higher-level abstractions than they are at thousands of fine-grained ones.
There is a balance of course, and over-splitting is a thing. But vehemently arguing that there is no inherent value is a bit of a stretch.
On the other hand, one of the main diseases I see in big code bases are overhierarchicalisations.
Going back even to the first discoveries of software modularity (Parnas et al) there was never any talk about trees tall enough to reach the moon. It's always been about two or three layers in the normal case. Anything else and we get lost in the vertical direction instead.
(Implicit: and the GC might already count as being in the bottom, third layer.)
There is a balance of course, and over-splitting is a thing. But vehemently arguing that there is no inherent value is a bit of a stretch.