I have been reading what everyone has to say. I will not ask "why do the tectonic plates not fall off the earth?" because I have read your explanations saying that they subduct under the ice wall. This certainly makes sense.
What I have not been able to find an explanation for is this:
Subduction zones cause oceanic trenches~

Sonar has been used, since the late 60's, to determine the layout of the ocean floor~

(this is a really terrible image but the trenches are the very dark/heavy lines that curve around some of the continents)
So, as you can see, there is no oceanic trench along the "ice wall"....it is not a subduction zone in the RE model. You claim that the FE plate tectonic model reflects that of the RE model. This seems to be impossible.
I seek a true explanation rather than a conspiracy theory one. Hopefully someone can provide one. Although, that seems highly unlikely.
Also, there are a high concentration of earthquakes and volcanoes at the land bordering subduction zones~

Why are there neither at/on the ice wall? Of course, a volcano would melt away the ice wall if it were to emerge from it. Then it would be a basalt wall, not an ice wall. Hmm. So many questions.