I still use it because I just find the observation about the TJ's to be very accurate. They do tend to blame a lot, and it doesn't even have to be a very serious issue. You keep pointing to what others (especially FP's) do, but he didn't say that nobody else ever blamed, or whatever. It's more about who has the inclination to be more quicker in the behavior. (and that doesn't mean that other types can't ever be quick at it for whatever reason).
As for the FP's, he said they "stuffed" their criticisms, not that they never criticize. Just like he said the TP's stuff their emotions, but they burst out with them eventually. That would follow with FP's and criticism. After all, their Feeling judgment is introverted, so I imagine the criticisms would stay inside first, and when values are violated enough, then they will unleash them to the world.
Some of the points you made were interesting. Where did you get those insights from?