As with anything pharmaceutical - they still need to make sure it doesn't have long term side effects. As horrible as it is to prevent treatment and prolong suffering, it would be more horrible if thousands of people suffer from unknown side effects if they would have recovered without it.
My takeaway that this drug was for folks that are literally on their “last leg”. I don’t think potential aide effects are going to deter such a patient, at least it wouldn’t deter myself.
It’s tough to worry about a future when you don’t have one.