Com on, Rob is 57, and thank God he dosnt strutt around like he taught he was a teenager, I cant stand it when guys at his age pop-around like they were 30 years younger than their actual age, that just becomes parody.
The reason he bends over I suspect, is to "push forward" the diafragma to ensure the quality.
The stageshow they put on is bombastic, the lighting, smoke, scenery...how many new bands puts on a show like that?? What more do you need to add?
Also, personaly I think that Diamonds and Rust for example is a song that suits Robs nodays more darker voice better than before.
But thats me...