Agreed. It's disappointing to see observational study after observational study pumped out and still little-to-no actual causal evidence after three months.
The U of Minnesota trial (which is a true vs-placebo trial) reported on April 22nd that they needed at least 200 more people to get enough power for their study. According to their web page[1] the interim meeting of the safety board is expected for today.
[1] https://covidpep.umn.edu/updates