Keep in mind that shot is at an angle. You would never use the monitor that way, so what you're describing as "weird" isn't exactly representative of how it looks when you're directly in front of it.
I've had the Westinghouse 37" flat and this 40" curved. I don't mind flat, but I prefer the curve. More immersing and makes stuff on the edges a bit easier to see.
If you don't think you'd like the curve, that's cool. That's why the 6500 and 7100 series exist.
I don't know if I would like the curve, no local store has one so I can test.
Curved makes perfect sense on a ultra wide monitor, but for a more "square" monitor like a 40" inch 4K, I am not so sure, would really have to try one before being able to decide.
The curved costs $500 more.