There was a time in the early era of scanning software, when scanning a positive (color or B&W) gave better fidelity than scanning a negative and "flipping" the tones.
Straight out of the scanner, I got better tonalities scanning Velvia or Provia as B&W than scanning equal-speed negative film (Ilford Pan F, Delta 100), in, say, 1998. That has improved a lot for most B&W films today (less so for color neg, which still requires a bit of noodling, since the orange base mask is not always consistent - cyan highlights with some films, violent blue shadows with Ektar 100, etc). Grain tends to image a bit finer from a positive - not sure if that is due to actual finer grain, or the electronic tonal reversal needed in scanning negatives,
Thus there was a "boom" in direct-positive B&W products and processing around the year 2000± (Agfa Scala, Dr5). Although Kodak had made direct-positive chemical kits for decades previously (for their own Direct Positive film and later for TMax 100)
Generically, the usefulness of direct-positive B&W processing is for: portfolio consistency, if one is showing "slides" and wants to include both B&W and color work; for projection presentation, or, less so today, for easy of scanning. One of my grad school "student jobs" was shooting copies of photos out of books for classroom lecture slides, long before PowerPoint and digital projection, using Kodak Direct Positive film and Kodak's chems.
Except for those purposes, there is not much value in reversal B&W processing (a bit finer grain, perhaps), and a possible downside: clipping of either highlights or shadow detail, since a "good-looking slide" that includes both pure black and pure white may block up at either end compared to a negative that is all grays (more detail, less "pretty" until scanned).
Dr5 does have the ability to tweak their developer to get different color tones to the "grays" - sepia, etc. Although that also varies with the film type used. Dr5 used to have more samples of all major available films in their process - can't see the link on their site at the moment.
If you really want to see how they do with your film, send them a couple of test rolls to see the real thing.