I believe in consistency.
I look up at the sky and I see tiny and not so tiny round objects all over the cosmos.
Allegedly, if I move to a different part of the World then the sky shall look very different. Which does not make sense in a flat Earth scenario unless we are actually residing in a space ship of sorts with a fake sky (mentioning that gives me 'hitchhiker's guide to the galaxy' goosebumps).
When a liquid is slightly poured upon a surface it will tend to cluster together into circular droplets. Bubbles behave similarly upon the surface of a liquid.
This is due to molecular attraction and surface tension at play.
And thus, in a zero gravity galactic scenario it makes sense that our Earth follows these same cues. Denser materials stay at the core and exert the greatest gravitational pull - and the molecules upon a previously much hotter World had no reason to not retain a circular shape...
A shape that once cooled sufficiently to form a crust was ravaged in part by geomorphological processes that rended the smooth unsmooth, producing dips and elevations - and over millions of years grew more complex and slightly ever more stable to produce the World we know today (with some 'help' from human activity.
Your point about eye-level horizon also does not seem to take into account that for a human perspective the horizon will seem eye-level as the distances concerned are very great. Also, elevation relative to horizon imposes not so great a factor upon this effect - and that is not taking refraction into consideration (different densities of air that produce light altering prismatic effects (the reddening sunsets, for instance) among other things).
Either way, thank you for sharing this post. Any information warrants at least consideration, regardless of one's preconceptions.
Pathforger---thanks for the insight. All of these questions can easily be answered and do not prove a round earth. Just take the arguments one at a time. Start with why stars look different in the sky when you move around the flat earth. Please check out my article on time lapse photography as a starting point and don't forget to follow me.
I must admit that I found the 'no curvature' video confusing, as I would not have expected that. Then again there are other aspects to consider such as the effect that one's chosen lens might have upon apparent curvatures - and since we 'may' be talking about a pretty large planetary diameter, it would not be too difficult for curvature to be imperceptible.
Maybe one way to resolve this matter would be for flat-earth believers to launch their own micro satellite into space?
Already done---here is a weather balloon at 114,000 feet showing a flat earth.