Why do the LabVIEW examples that use the queue design have one loop in the top level and all the others as subvis?

Specifically the Weather Monitor example under connectivity/Web Services and the FPGA design examples.
There are several parallel loops. One of the parallel loops will be in the top level VI. The others are all in sub-VIs. After the third example I was looking at it seemed obvious this was being done as a standard, but I don't know why it matters.
Why not all of them as SubVIs? Why not all of them as top level loops? (Well OK maybe not that one.)

For me, it depends on what is happening in the parallel loops.  When I have modules that just need to run in parallel with the main loop, it helps reusability to have it a a subVI call.  I can then just copy that library to another project and use it.
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