True, but I don't agree 100% on not considering Steam as a whole to be blamed, because if you don't set a proper and standard rule you can't dump the responsibility only unto the staff.
As you wrote they need as a whole, board of direction and staff put their shits together and decide once and for all what is good and what not, because this isn't a good way to handle things.
Let's hope this are just the hiccups that can happen when you just started managing certain contents, and maybe in the future Mist can come back on the platform, because it deserve the be seen and played imho.