What a novice usually does not realize is:
It is easy to be right. What is hard is being actually helpful, coming up with a viable solution (vs. an idea).
In the posted article there simply was no such solution. It was not viable. Unacceptable.
Yes, an outsider with fresh eyes might see things differently and without bias, but most certainly the experienced team knows damn right that you're right (to some degree), but also knows that it's just not that easy.
Throwing "We are doing this all wrong" around is often just short of saying: "I just came here and I immediately saw that you all are idiots, you should listen to me!".
I'm not saying that fresh input can't be helpful, outsiders might bring in new tricks and ways, but being humble is way more helpful than being loud.