Hmm, good points.
Most of these have some kind of (strong or weak) counter-arguments.
I have mixed thoughts about the first point, they kinda have some good points though.2 and 4 got resolved, very critical issues nonetheless, shouldn't have happened. The 3rd point seems kinda OK, I'm sure they would like the idea of making that open-source, but that would probably make it bypassable, correct me if im wrong. I didn't know about the fifth! The reason they gave also seems defenseless.
Concerning situations for all of the points.
Not trying to hate or back up Signal here, just my opinions.