I will clarify, or at least try to in my own feeble way. I am talking about plugging into ideas (including musical, but not only). I don't feel that U2 are plugging into anything much right now, except riffing on the idea of being a survivor rock band after 20 years and what it's like to be a mature man in a band, and so on (and yes, the sorrows that come with middle age). That is not a terrible thing at all, but it's a fairly narrow spectrum of what life is about. And more particularly, for a band with U2's history.
I also agree with people who find their recent lyrics and tunes to be bland and predictable. I have a big problem with that. It's a harder one to define as I know many people don't find their recent songs bland at all. It's just that I do.
Some people here seem to be afraid of intellectual things but I'm sorry, rock and roll is not only about the beat. I know some bands give 'arty' rock a bad name (including Radiohead if you hate them, I guess. I love them but again, a personal choice), but it's not a terrible or elitist thing. Nothing artistic can happen in a vacuum and I feel like U2 are operating in a bit of a vacuum these days. They don't seem to be interacting with the wider world in any way. I will try to cut a little closer to the point and say that I feel a lot of their recent songs (ie. most of ATYCLB) do not stand up to much scrutiny when you remove them from the context of U2 and what we know about U2. And I just happen to think great artistic work should be able to survive apart from the people who made it.
And more crudely, I just don't like the tunes that much. You've got to have a bit of gall to say it's all about the songs now and then turn out tunes that aren't as good as the supposedly kitsch and superficial POP songs. Let alone not coming within cooee of someone like Nick Cave.
U2's best music has always felt bigger than the people who made it, at least to me. Because they weren't only drawing on their own experience or what they thought about things, they were stealing left right and centre from anything or anyone who might be worth reacting to. Recent music from them just feels like a bunch of songs that any number of bands could have written. Some of them pretty good songs, granted.
As for the POP era vs ATYCLB, the best example that comes to mind for me is Please as compared to Peace on Earth. They are basically the same song. But for me, one of them works and one does not.