This can be argued, the logic for flat earth works for certain range of parameters, it works when you have to walk to the nearest ATM & your phones flat screen

Same way the only way Einstein’s special relativity is better than Newtonian motion is that relativity is more general https://twitter.com/fuadxiv/status/1246510405368905731

You can derive Newtonian mechanics as a low velocity approximation to special relativity

Sure enough, the flat-Earth theory is an approximation to the round-Earth theory for small distances