What makes FET fail - is things like the observations that any human can make for themselves, very easily, just looking at the Sun and Moon and spending a few minutes thinking carefully about what they see.
FET fails on so many levels, so many issues, so many facts... When you take into account the "chain reaction" a given denial or assertion causes, for instance, the sun being a ball of light, a flashlight... Just think of how many other facts, observations, plain phenomenon of reality this contradicts with in a chain, you can easily say that the FET needs to rewrite, remodel, reset literally hundreds of thousands of facts, and not all them related to astronomy, to even try to stay afloat. What do I mean by "chain reaction"? Well, lets think, why is the sun depicted as a small ball of light that acts like a flashlight? To be able to explain day and night on a FET, thats why. Funny, yes?
OTOH, I DO understand the flatters. I too am scared and bewildered when I think of space, when I think of the sun so large that it can contain 1.3 MILLION earths... That the biggest known sun, Canis Majoris, can contain 6.9 BILLION of our suns. etc. The utter insignificance of human existence is mind boggling in the light of these facts. What the subatomic particle is to us, we are to the universe... Gives me panic attacks. And the fact that we are able to COMPREHEND this and we still die away into nothingness is another cruel fact that I have not encountered any words in any human language to describe how cruel.
So the FET does give some solace, does open up a possibility to the human where it is being treated a special existence. No dark, ever expanding gigantic unfreindly universe in FET. It's human centric. And quite cosy with the wall surrounding the oceans etc.
And it's perfect movie material. But I digress...