Well I guess it's a matter of personal taste, then. I much prefer large spans of wilderness with settlements dotting the desert oases than provinces that encompasses nothing but 98% sand. The recent versions reduced the amount of on-map wasteland by 50% in this highlighted regions, making the super large desert provinces feel much too empty and large.
Current Version of the Map, Wastelands
Old Version of Map w/ Oasis Provinces, Larger Wastelands
Comparison Overlay Between Versions
Not just a matter of personal taste.
For instance inner Arabia, especially Nejd would be represented incorrectly if you have
oases there and nothing in between. The nomadic Arabs lived mostly in between those oases, they were moving across that land. Arabia is mostly inhabited semi-desert, not uninhabitable wasteland and thus the current map reflects reality much better than previous one (btw, from which version is that? I was SWMH team member for few years and IIRC, neither of your maps reflects any version of SWMH I can recall, since like 2014 or so...
If you talk about this particular submod, then talk about the submod and criticize the submod, not the SWMH map. If you are as critical as you are, be at least correct.
And you are wrong in SWMH having provinces with 98% of sand. It is SWMH which has placed wastelands into uninhabited wastelands instead of provinces which are 98% sand (in vanilla). With very few exceptions (each of which has some good reasoning behind) all the provinces cover area which was inhabited, even if it was semi-desert.
Also, there is no example of too large and especially blocky provinces (in SWMH, not talking about the current stage of this submod, which is still in development). In some areas the provinces might be quite large, but they always take into account local historical reality and I would swear they are not blocky. But please correct me if I'm wrong.