I'd think that PB would be interested in expanding their readership rather than narrowing it by getting so far afield from the onscreen canon. That is, if their goal is to keep selling more books.
And, according to Marco, IIRC, these innovative books of the DS9 Relaunch sold incredibly well.
I became a fan of ST in 1979, via ST:TMP, and became fascinated by Andorians almost straight away, even though they were barely in TMP. I wondered, even then, if we'd ever get a novel that featured Andorian culture, set on their homeworld. Never in my wildest dreams did I think something like "Andor: Paradigm" would ever happen. Not a ST regular character in sight, but still so very much ST.
This debate reminds me of an interstate convention I went to, where the committee got swindled of all their cash and a US agent tricked them into getting...
no celebrity guest. I used to attend conventions solely due to the calibre of the guest, and yet this fan-run convention had to struggle on without a drawcard. It was still a Star Trek convention, we had the best time, and yet there wasn't a celebrity in sight of the place!
Of course Pocket Books are interested in expanding their readership. The DS9 and VOY novels used to be Pocket's
poorest-selling novel series. The relaunch of both lines, post their canonical TV finales, turned out to reap in thousands of new readers. Getting "so far afield from the onscreen canon" was exactly what many fans were looking for. And, if a DS9 or VOY fan suddenly decided to
start reading the licensed novels, and wanted only stories set within the TV series of each, there were already many, many titles (at least 28 DS9 and 25 VOY, plus the more recent "String Theory" trilogy), some still in print and on the shelves, others in second hand stores, for them to choose from!