But if you're actually using your brain, FE is obviously retarded.

Actually, FE (the heavily advertised/funded psyop) is obviously retarded intentionally so that you will never seriously consider (aka use your brain to evaluate) or earnestly discuss the important and valuable subject.

There is no way, in any configuration, that the sun operates in the way we observe it if the Earth is flat

That’s silly. IF the earth is flat, then everything we observe - including the way the sun behaves - occurs on/over a flat earth. It’s a tautology. The shape of the earth obviously isn’t dependent on the motion of the sun above - don’t be silly!

There's simply no way it works.

You keep saying that, but it is very silly. Of course IF the world is flat, it clearly does work - despite your objections. Why do you think it is impossible? You haven’t explained your reasoning as much as you have declared your (mistaken, in my view) position.

but then completely fails to question the ridiculous assumptions required by FE.

There is no unified “FE”. That’s the heavily advertised (i.e. funded) and intentionally offensively stupid psyop! The assumptions you find ridiculous are contrived and advertised specifically to be ridiculous!

FE is a test that many fail

Agreed. Independent validation of claims encountered is not something most of us ever get any good at. We are, instead, conditioned by rote under the guise of education from childhood. This is why people believe the world is spherical in the fist place, and why it is so easy to convince them otherwise.

If you would like to learn about earnest flat earth research (very different to the psyop FE you have experience with), or even just express your criticisms - please join us on flatearthresearch!