I would wager it's not more popular because it just simply isn't as well known, and lots of people want an off-the-shelf plug-in solution. A bunch of people don't really care for having to modify products, or want a super-whiz-bang feature rich solution like an arduino type of controller.
You can also do a similar setup with a simple potentiometer, a MeanWell LDD1000-L, and a few diodes with a series resistor as a simple shunt regulator (or for this particular application, a TL431 shunt reference) to supply ~2.5v for the pot. Same setup would also work with the LDB-L series drivers, just with a 10v supply for the pot, such as the LM7810 which can also provide DC for your fan supply if needed, and the LDB driver has the added benefit of being able to supply higher voltage than your input voltage, which is handy for running smaller CoB type arrays (such as the Bridgelux Vero) on smaller tanks and setups. You could easily run everything off of a 12v supply this way.
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Last edited by Lingwendil; 10-30-2017 at 02:01 PM.