Because my main use would be watching movies. I'll play some games but not like everyday, and I don't mind playing at 1080p. Also, as you said, 1080p scaling on a 1440p monitor is poor. And all the movies I watch are at 1080p. And actually, what made my consider buying a 1440p monitor in first place, is because I came across the u2515h while I was searching for a good quality 1080p monitor.