IDK, I think the reason for freighters is that they can get absolutely *lost* in the middle of the ocean while avoiding storms and since are built watertight (ideally) can be made airtight. And they can carry lots of stuff.
book 2, I think, had the Open Source Ships (built out of single cargo containers) launching from all over. The cargo ships were just convenient vehicles to strap a drive to, available at scrap prices in an economic depression.
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