It does, but not until it reaches a critical mass. Texas new cases started drastically declining first week of February, and there's no way the vaccine could have been responsible for that (since less then 10% were vaccinated)
Better weather leading more people outside, which may be safer than being inside in poorly ventilated places, could be a factor in reduced infections.
Using your type of crazy math, a 20% decrease in mask usage should lead to a 20% increase in infections. Then, by your type of math, shouldn't a 10% increase in vaccinations lead to a 10% decrease in infections, lol.
But, then, what if a 10% increase in the vaccinated is more powerful than a 20% decrease in mask usage? What would happen then re infections? Would they go up or down?
Now that over 50% of Texans are vaccinated, shouldn't that, by your wonderful math skills, lead to a 50% reduction in infections?
You say mask usage went from 100% to 80% & even lower now. But where are you pulling this stuff out of? Your derriere? There have been many places with mask mandates where many people still did not wear them, even with large mass rallies happening, including some super spreader events. So obviously mask mandates do not mean 100% of the people - including covidiots & rebels & people with mask exemptions for health reasons, & babies, etc - are wearing them. And with news of more infectious & deadly covid VOC in the USA & elsewhere, wouldn't that be a motivation for people wearing masks to keep wearing them & for those who weren't wearing them to start wearing them?
You have suggested that wearing dirty masks may lead to even more infections, implying that such masks are less than worthless & detrimental. How, then, can you draw any conclusions re mask usage affecting the number of infections? Have you figured out yet whether or not mask usage lowers or raises the number of infections?