Nobody is bound to it though. That is why there are so many 'models'
Round Earthers are stuck on one model and for the most part, it doesn't matter what new information gets presented, unless mainstream think decides to change, individuals wont.
There is pretty much just one RE model with different levels of simplification, because Earth is round.
Because this one model actually works to explain things.
It has nothing at all to do with indoctrination.
There are so many different FE "models", because none of them work to explain reality.
So they need different models to try to explain different aspects of reality, pushing the problem around as they do so.
This also means that FEers do not simply see what is true. If they did, they would all have one model, not numerous contradictory models which cannot all be true.
Being open to the possibility that you are wrong doesn't mean accepting unsubstantiated garbage, nor rejecting what is supported by mountains of evidence.
Meanwhile, how many FEers do you know of that are open to the possibility that they are wrong, and that Earth is actually round? NONE!
If they were, they would have accepted all the evidence showing Earth to be round and accepted that Earth was round. Or at the very least, they would admit there is no reason to believe Earth is flat.
But if our universe is nothing but a holographic projection from a 2D source, well that sounds like we live on Flatland. It's just physics we haven't learned about that makes our world appear spherical.
No, it doesn't. 2D does not mean flat.
Keep in mind also everything about the universe lends itself to a flat shape. The universe is said to be flat. The Plane of the Ecliptic, flat. Many galaxy shapes - flat. Earth - flat.
The universe is EUCLIDEAN, not flat in the sense of a flat object.
You have literally no basis at all for claiming Earth is flat.
How do you explain, given you believe in a flat earth, that your view of the moon is upside down with respect to my view?
The moon being upside down is trivial. The impossible part is explaining why the view is different ~only by a rotation, rather than seeing a completely different area or it being skewed.