Yep. I think that's how most people see those lines as, too. Doesn't mean they look nice, though!
Just my opinion, of course.
There was something more intentional and unapologetic about the split top and bottom panels of the 5/5S. Something about it was classier and more subtle. Cleaner. The glass portion made the metal portion look better, and the metal portion made the glass portion feel functional. They complimented each other.
The antennae lines of the 6/6S generation, though, break up the one sleek slab of metal into awkward pieces. They draw too much attention to them, and don't really say much. They create this weird framing around the device that, I think, is aesthetically unpleasing. It goes against what Apple has always championed: clean, uniform, and sleek designs. In this case, the breaks do not compliment each other as they did in the 5/5S.