Neuroimaging and neurofeedback as future tools in mental health therapeutics

Can we look forward to portable fNIRS-driven neurofeedback? I believe that the use of biofeedback and neurofeedback techniques has a role to play in future therapeutic pathways for the treatment (and diagnostics) of mental health conditions. The below is a somewhat rambling essay on what I see as the background and current state of the art in the study of working memory as a biomarker in stress and other mental health issues and disorders.