There's evidence that masks don't work to prevent COVID spread at all:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7680614/
"A meta-analysis among health care workers found that compared to no masks, surgical mask and N95 respirators were not effective against transmission of viral infections or influenza-like illness based on six RCTs.
"Using separate analysis of 23 observational studies, this meta-analysis found no protective effect of medical mask or N95 respirators against SARS virus."
"A recent systematic review of 39 studies including 33,867 participants in community settings (self-report illness), found no difference between N95 respirators versus surgical masks and surgical mask versus no masks in the risk for developing influenza or influenza-like illness, suggesting their ineffectiveness of blocking viral transmissions in community settings."
Masks also make breathing more exhausting:
"Wearing facemask mechanically restricts breathing by increasing the resistance of air movement during both inhalation and exhalation process"
"trapped air remaining between the mouth, nose and the facemask is rebreathed repeatedly in and out of the body, containing low O2 and high CO2 concentrations, causing hypoxemia and hypercapnia"
Being forced to wear something which is ineffective and physically exhausting could absolutely cause burnout.