Well, it amounts to this.
No "decent" High Contrast Gray screen possesses a gain over 1.1, and most clock in at <0.8
Most all such screens excessively mute Whites to a greater extent than they allow for improvement in Black levels..ALL
such screens cost disproportionately more than any potential gains in performance would deem worthy.
advantage they have is they are ready to hang and shoot an image upon OOTB.
Disadvantages include Waves / Curling / Texture / ...etc. Using a Tab Tensioned screen at least absolves one of dealing with such uncertainties / probabilities....but as you might or might not know, there exists not a single example of a Tab Tensioned Screen in any other type finish than matte white. If one needs High Contrast, resurfacing such screens is the only option available.
The screen shown in the Thread I linked to represents a level of performance achieved by (...or attempted by...) Mfg Screens costing in excess of $3000.00+
As such, absolutely....the "performance to value" of painting on a high performance coating on a mundane, under-achieving Mfg screens amounts to be not just well worth the time, effort and expense, it's a no-brainer.