Yes, I've said it a million times, seems like.
Why it's not more prevelant on the last two albums is a dissapointment and maybe a mystery.
The chorus of Walk On has excellent harmonies. They didn't use it much else where. Edge sounds better than ever and Bono is served better with Edge singing to give it the fuller effect. COBL among others has great live harmonies. Where the fuck are they on the album? A half dozen other songs are boosted by harmonies. It does make a big difference.
as for what Zoot said "bring their sound even closer to POP"
I don't get that. Harmonies are used in everything from bluegrass to Alice in Chains. Rick Rubin used it with the RHCP, 1-because Keidis needed the help 2-because it was one of the most underused aspects of a rock and roll band in the last 10?15? years. Maybe more, it's hard to think right now. 3. Because it soudns good, Frusciante and Flea sound great as an offset to AK.
If Bono and Edge sounded liek crap together, okay then I see it.
But they sound great, and I do mean great together. I think Edge has really hit his stride vocally.
The single most underutilized weapon that U2 has-Edge's voice.