MY OPINION ONLY:
Robert likes his solo career
Jimmy wants to play hard rocking Led Zeppelin songs
JPJ wants to play hard rock
The part that will make people mad:
Robert dips into the Led Zeppelin well to boost his solo prospects
The long term fans get their hopes up, then get their hopes dashed, and then many get angry at Robert
I get very angry at Robert, but also agree with his rationale, and the rationale of those who believe that LZ died in 1980.
However, I never got to see LZ, and would be thrilled to see a modern facscimile.
Many of us:
Never got to see the Beatles, but enjoy watching Paul or Ringo sing the old songs.
Never saw the original Stones, but can now watch a legendary band put on a great show.
Never saw the Who with Keith Moon but now can watch the Two put on a great show.
Saw the Kinks and wish they would come back.
I saw Page/Plant. That may be the closest that many of us, including myself, ever get.