Keith Jarrett is one of a rare breed. I don't know how many pianists started playing at age 3. But he's in a small club which includes Errol Garner. A big reason, I believe, his skill has been so massive. He was still following this muse (as in the 1967 video) in his American quartet in the 1970's. It's some of my favorite music from planet earth.
I have to say I too, have grown tired of one solo (completely) improvised concert recording after another. I've often wished he'd return to doing some things in his 70's group stylings. But it seems not to be. OTOH, my lack of appreciation for his solo concerts isn't his shortcoming, it's mine.
I sometimes cite my personal "holy trinity" musically speaking as (in no particular order) Ellington/Strayhorn, The Beatles, and Keith Jarrett's 70's quartets - both American and European.
I recently bought Jarrett's "Sleeper" CD which was the European quartet in Tokyo around 1979. I have to say, I'm having difficulty getting into some of it. Again, not his shortcoming, but mine.
For anyone thinking he's compulsively always out on a thin tree limb, I recommend listening to "Jasmine" or "Last Dance". Both are duo recordings with Charlie Haden. KJ slims his playing down to essentials on these two recordings. Very disciplined and sparse. Showing how much of an artistic giant he is. On the other hand, as a human being he seems to be very difficult. But I don't have to live with him.