Have you seen Chicago across lake Michigan, personally? What if..... we are on a misshapen ball, with multiple flat areas? To be completely open minded about what is possible, is a good thing. But when you place absolutes (on second hand information) subjects we will never likely be able to verify, is just swinging from one lot of dogmatism to another.
For instance, the rectilinear experiment showed that there is a slight incline not that the surface was flat, if you place a magnet in water it repels the water, you can actually see an inclined curve against the edge of the magnet, showing that water can curve. I can go on, but I'm afraid it will land on deaf ears. I have been talking about flat earth on this site for a couple of years now, before it even went mainstream. When I say neither has been proven conclusively that is because, there are many questions yet to be answered, in all likelihood it will never be proven, maybe it's secret is part of the construct, of this life we face. What we know is that there are anomalies to accepted theories.