The reason they reduced the damaage loss on a positional initially was because they perceived them to be overly hampering Monk in Alphascape where 2 charges of True North really didn't cut it for the number of times your movement could get locked down. But that's somewhat muddled because they also tried to buff Monk and Machinist that patch in a desperate attempt to get player numbers up for them. The thing was though, that really didn't change it.
At this point I also don't think Monk being the least played job is even strictly a matter of positionals, it's more of a death by a thousand cuts thing. Until now playing Monk has been a pain in the rear compared to everything else. Why deal with the headache of Monk and Greased Lightning only being upkeepable with a dozen niche skills when anything else with a more or less identical buff can keep it up by hitting literally one button and also gets rewarded by incredibly satisfying nuke skills like Foul, Xenoglossy or Stardiver. New players see that and don't bother, or they're intimidated by the positionals, the Form Based combos or the memes that have built up around Greased Lightning over the years so people don't jump onto it often. At this point Monk also pretty much has the reputation as being the the job the devs neglect which might have an impact as well. Why play a job the devs have eternally ignored and which people haven't been satisfied with for for nearly two and a half expansions now. If people do give it a try it's leveling curve has been trimmed out so it feels very bare bones and there's been very little in the way of skills and traits that you get and actually use so it doesn't retain people to 80. Then the people who ride it out to 80 don't stick with it because there's just nothing satisfying about playing it compared to any other job which are consistently getting at least 1-2 new exciting skills an expansion, while Monk is the only DPS job with less rotational skills than any iteration previously.
The job is just a continued disaster and they don't seem to listen to any of the feedback regarding it in the way they listen to the feedback that other jobs get (Shoha got reworked in a patch, people have wanted reworks for Monk skills for literal expansions and we still haven't gotten them).