I think as a collective, Sphere was the best they've ever sounded live in the 17 years I've been seeing them live. I don't know how much of that is the tech stuff, but they were excellent.
Bono definitely doesn't sound as good as in his previous eras, but I would also argue he doesn't - and the band doesn't - play to their own strengths and haven't for years.
I listen to Bono on Cedars of Lebanon and he sounds incredible. I would kill for him to sing in that register. An album of downtempo tracks like Wake Up Dead Man where his voice is all gravelly? Yes please. I know that was 15 years ago now (jesus fucking christ) but he could slip into that easily. There's a few other small examples of it, like on Sleep Like a Baby. Some tracks he goes a little bit harder and still sounds good (although how much is studio tech?), like Red Flag Day and Landlady he sounds great.
Instead, as I've been saying for a fucking decade plus now, they just refuse to play to their strengths, or lean into their age. Then we end up with abominations of songs where he's oversinging to a really shit tune.