Matt soldermasks in my experience always reduced the incidence of solder-
balls at wave and selective solder when we could alter from semi-gloss or 
glossy. They also helped reduce the incidence of stubborn PCB design feature-
related solder bridges. With no-clean fluxes, the residues are often less 
obviously visible too. A side benefit is that operators working on the PCBs 
especially for any close visual inspection will experience less eye-strain/fatigue 
than with shiny/glossy boards.

PCB suppliers usually want to stick with a limited number of different masks, 
preferably one, throughout their factory. So to change for you will require 
some leverage to other customers, or extra cost. 

One response might be... OK the PCB supplier wants to charge an extra 3% 
but we save 3+x% in rework costs and improved operator health benefits, 
meanwhile we work on the supplier to move to our preferred mask at 0% cost 
increment.

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