Yup. There are plenty of other trial designs that circumvent the (perfectly valid) objection to control groups being denied treatment. For example, both groups

Yup. There are plenty of other trial designs that circumvent the (perfectly valid) objection to control groups being denied treatment. For example, both groups could receive the intervention, just not at the same time. While one group waits the other receives the intervention. The waiting group may be considered a "control". After this period of the trial completes, the waiting group is given the active treatment.