It is one of the few forms of PTSD therapy where there is plentyful research about its effectiveness? In Germany, it is basically the only trauma processing technique covered by health insurance, because of its proven track record.

see e.g. Psychological interventions for adult posttraumatic stress disorder: A systematic review of published meta-analyses (2025) https://doi.org/10.1016/j.janxdis.2025.103017

State of the science: Eye movement desensitization and reprocessing (EMDR) therapy (2024) https://doi.org/10.1002/jts.23012