What it isn't, strangely, is a TfW Network Rover, which you would think would be easier to market than "Wales plus the Marches".
There might be some Tourist Board influence here, who don't want to spend their money promoting someone else's domain.
The North Wales ranger ticket is linked to local authority areas, and the "Denbighshire" zone is all of 5 miles of the NWML from Prestatyn to Rhyl (plus a range of bus services).
The English "borders" part of the franchise is generally the most profitable (or requires substantially/comparatively less subsidy than Welsh routes) and is the bit that is generally controlled or specified by DfT.
DfT is fairly neutral on products like these - certainly not interested in expanding them (if anything getting rid of them simplifies things and it would mainly be the enthusiastic market that would complain.
Rangers/rovers are definitely a legacy product and even though new ones are occasionally introduced, they're rarely commercially successful and are normally to show that a company is considering ESG issues.
Unless/until you fully integrate these into journey planners and apps etc, that's how they will always remain.
Foreign customers looking for multi use products are generally going to be heading to InterRail or Britrail - so the audience is a limited domestic one, and once you have a partner and a couple of kids, you may as well take the car.
Enthusiasts are generally the only market these reach.