Oh I dunno bro. I think Robert Plant and his 5 solo bands and side projects have been very hard to deal with. His last great record was Fate of Nations. I loved everything he did post-Zep in the 80s and early 90s and then suddenly when he did the Page/Plant reunion thing...he just fell back into the hippie style of rock.
Now and Zen, Pictures At Eleven, Manic Nirvana all classics to me. He just seems to have abandoned rock music for folk rock.
Obviously, you know much more about Plant than I do. I’ve checked him out occasionally, and have been very impressed every time, especially, his Strange Sensation Band period (https://www.youtube.com/watch?v=fJoarBi19QM), with the incredible guitar player Justin Adams, who since went to some weird African music projects.