At the end of the day, you questioned what someone else preferred and in a way they are right, it is as simple as this:
Smoothness/motion clarity - 100fps looks better than 50fps
Sharpness/clarity - 3440x1440 looks better than 2560x1080
Surely even you can understand this???
I know for a fact that if playing the likes of CS:GO, BF 4 or any fast paced game, I would much rather have a lower res. display with 100FPS over a higher res display with 50FPS
Again, I invite you to try this out:
http://www.testufo.com/#test=photo&photo=eiffel.jpg&pps=960&pursuit=0&height=0
Set your refresh to 50HZ and 100HZ and then get back to me telling me which refresh rate/image looks better.
If you need more education on motion blur, here is a superb in depth article by tftcentral:
http://www.tftcentral.co.uk/articles/motion_blur.htm
EDIT:
And yes that is my last say on this, just going around in circles now.
If anyone wants to discuss this further, create another thread as this thread is only for 21.9 content.
EDIT:
Back on topic, just seen this:
Acer Predator Z301C with 30" Curved VA Panel and 200Hz Refresh
Looks good, hopefully we see a freesync version too...
30" 2560x1080 should be pretty decent, adds just that little bit more height whilst still keeping a decent PPI value