That's interesting, and I think there may be some truth to this, I'd need to give it more thought, it's certainly worth considering. However, if Bono's lyrics are more "awkward" because he's writing more personal stuff...well, that's on him as an artist. To the extent writing about personal stuff makes his lyrics suffer (and again I'm not sure if I agree), he needs find a way to express himself better if he want's to write about those things.
Now this presupposes that 1) his writing has suffered in the 00's and; 2) your premise that this is a result of his writing more about personal stuff is correct. I'm not entirely convinced of either...he's written some great stuff in the 00's, both personal and the more anthem/traditional U2 stuff. And he's written some crap stuff of both types as well. I'm not sure there's really a connection between the subject matter and the quality of the lyric. I'm not saying you're wrong, it's as good a theory as any, I'm just not sure. It's hard for me to get a handle on whether his lyrics just aren't as good anymore, or that the songs in general aren't as strong so we're noticing the weakness of the individual parts more.
As an aside, I'd point out that some of his most criticised lyrics from the 00's come from NLOTH, in which he supposedly was writing in the 3rd person, and not necessarily from his own POV. So there's that.
I agree that it's not that simple.
In fact, I'd say that (IMO) Bono seems to write lyrics that resonate when he's telling a story, whether it be fictional, autobiographical, whatever...
I've said in the past that his so-called "personal" lyrics come off sounding less inspired and to be honest, kinda shallow, not because I hate personal lyrics or because it's too easy or because it's not interesting etc...but because it just (once again, IMO) doesn't resonate.
For example, the song SYCMIOYO..I'm not saying Bono didn't put his heart into the lyric, or that he was exploiting a personal tragedy, that's ridiculous...but something about it just doesn't come together...it just doesn't carry much weight. Lines like "we fight all the time, you and I, it's alright, we're the same soul"...sure it's simple and direct, which isn't a bad thing, but those lines plus pretty much the rest of the song don't give me any insight into the relationship and the loss of it. It doesn't sell the emotion because to me that sounds exactly like what it's trying to accomplish.
Now the song "Dirty Day" isn't the greatest song of all time or anything, it's not a classic U2 song to me, although I do enjoy it. And maybe he is writing from another point-of-view...however I do get the feeling that he's purging something. That through this character he is confronting some demons from his past. And on "The First Time" I always got the sense that in the last verse he is (through a famous parable) confronting his guilt about running away from his widowed father. And the song "One", while not being explicitly about his father, always struck me as an argument he was having with the old man.
SOmetimes it is good to be explicit and to cut right to the core. I think Mofo's middle 8 proves that. Sometimes it's great to just get it out.
Anyway, what I'm trying to say, I guess, is that these "personal lyrics" don't always yield the best results, maybe because it's too conscious of an approach. Perhaps losing himself in a character brings a bit of truth out, more than actually tackling the subject directly.