One reason is that it compensates lower temperature with longer wash time and uses airflow instead of heating to dry. Both are measures to reduce the environmen

One reason is that it compensates lower temperature with longer wash time and uses airflow instead of heating to dry. Both are measures to reduce the environmental impact. The same is true for energy efficient washing machines by the way, they often do not reach the temperature a program states and compensate with longer washing times. This may be problematic for hygienic reasons at times but has a noticeable impact on energy use.