I agree with you for point 1 and 2.
But for the point 3, it looks like they actually designed the power supply to keep the batteries charged. They just have reach a level where the safe power mode has been activated, disabling all non essential function from the spacecraft. (it's a design choice to consider TM/TC as critical or not, I would say that it should stay on, but it can be discussed) Note that reaching a charge level that low could be linked to the fact that they have lost for several days the contact due to 1 and 2, which has delayed the SA deployment. (I haven't look in detail the design of the satellite, but usually a satellite get less power when the solar array are not deployed)
And for the point 4, it's a "design" choice. They have looked for a cheap launch to test a first version of their satellite, and found that one.