Is this part of the reason why the Star Trek books stopped being numbered? I remember when I was buying in the 90s, the vast majority of them were numbered in each series, other than the giant or hardbacks, then they all stopped being numbered.
Sort of, I think. As I recall, part of it was concern that new readers were being scared off by the high numbers, thinking they'd have to read 97 previous books before the current one. So taking off the numbers made it clearer that they could start wherever they wanted.
The irony was that this happened around the same time that the books started getting much more interconnected and serialized -- so the standalone books were numbered and the series books mostly weren't!