I linked this to an IRC channel full of people skeptical of SI. One person commented that

the reply doesn't seem to be saying much

and another that

I think most arguments are 'yes we are bad but we will improve'
and some opinion based statement about how FAI is the most improtant thing on the world.

Which was somewhat my reaction as well - I can't put a finger on it and say exactly what it is that's wrong, but somehow it feels like this post isn't "meaty" enough to elicit much of a reaction, positive or negative. Which on the other feels odd, since e.g. the "SI's mission assumes a scenario that is far less conjunctive than it initially appears" heading makes an important point that SI hasn't really communicated well in the past. Maybe it just got buried under the other stuff, or something.