No! Myriad of studies are demonstrating messaging therapy can be as effective as traditional therapy for the treatment of the most common emotional and behavioral health issues such as depression, anxiety, substance abuse, stress, PTSD and more.
Check out some of the research published on the field:
Linda Godleski, M.D.; Adam Darkins, M.D., M.P.H.; John Peters, M.S. (2014) “Outcomes of 98,609 U.S. Department of Veterans Affairs Patients Enrolled in Telemental Health Services, 2006–2010”
Andersson, G., & Cuijpers, P. (2009). “Internet-based and other computerized psychological treatments for adult depression: A meta-analysis.” Cognitive Behaviour Therapy, 38(4), 196-205.
Barak, Azy, et al. (2008). “A comprehensive review and a meta-analysis of the effectiveness of internet-based psychotherapeutic interventions.” Journal of Technology in Human Services, 26.2-4: 109-160.
Wantland, D. J., Portillo, C. J., Holzemer, W. L., Slaughter, R., & McGhee, E. M. (2004). “The effectiveness of Web-based vs. non-Web-based interventions: a meta-analysis of behavioral change outcomes.” Journal of Medical Internet Research, 6(4).