Of course it matters if it looks round. If it goddamn looks round, then it has to be fricken round. Bendy light doesn't cause the earth to 'appear' to wrap around on itself.
But the fact that our everyday observation of the Earth shows it to be flat doesn't matter at all? That old ugly RE double standard rears its head again.
I'm confused as well.
Do you mean that the ground looks flat when looking towards the horizon because I gotta say, without anything in the way, it looks curved.
The sky even looks like a dome to me, though that may just be my imagination.
And if you go high into the sky, the Earth looks like a circle. But it's a circle in which parts of it are not visible.