Presumably this is being ignored by the flattists because they are ashamed that a round earther such as myself has understood more about their theory than they do?
This happens quite often to me, here is a list of topics that are unanswered, or just things that FET has no explanation for.
1.) What the sun uses as its power source.
2.) What moves the sun in its horizontal motion.
3.) Why is spaceflight impossible using the dark energy at the edge of the earth. (if it is so powerful as to crush rockets and humans why does not it erode the side of the earth?)
4.) Stellar parallax - Why would some stars move relative to the earth while others do not move in UA
5.) Retrograde motion - their model produces the wrong shaped movement in the sky, and if altered it requires Epicycles due to the suns position over the earth.
6.) Why when the signals that GPS satellites use require LoS they still provide accurate readings when no towers are visible, when in valleys, and when behind mountains.
They do not have answers for any of these questions because the only reason that the believe the earth is flat is because it seems to be when you walk outside, and therefore must be.
(or because they refuse to jump to conclusions without any hard evidence, except without seeing the whole planet they are willing to believe it is flat)
This is not an attempt to derail this thread however, so if you have an answer to one of these questions use the search function and answer it in the appropriate thread. This thread is about why the earth would not gradually decrease in size.