There is also already decades of data on steady cognitive decline due to AZ with and without various attempted treatments. How many more times do you think that needs to be proven.
I don't believe you fully understand the purpose of an adaptive open-label trial, which was approved by the FDA. It met its endpoints and the data will enable the company to design a meaningful Phase 3 with a high probability of success.
There is more to this drug (MoA) than just Alzheimer's. Great things are about to happen, including a partner and/or grant.