There is a point where bandwidth is so huge that with a bit of medium and a pair of repeaters, it becomes memory.
You are referring to the old "delay line memories" from yesteryear:
A truckload of TB disks will give you awesome bandwidth by driving it around to the destination.
The latency of a particular call, however, wouldn't make it usable.
Memory is hierarchical, but any latency beyond NVMe is non factor for treating remote data as memory
In what use cases all remote data is required in real-time?
Think an index, reading different files, etc.
Then the latency dominates
If you do that with a Voyager, it will be about a day or so, IIRC.