I've seen both 2008 and 2017 incarnations of King Crimson and they are a magical act to witness. The 2017 was very memorable as a I was sitting on Gavin's and Fripp's side of the stage. When Gavin did his solo in the 21st Schizoid Man song, Fripp was smiling! A full smile! That was the highlight of the show for me.
After the initial reunion shows with Adrian (the 2008 band), Fripp kind of went away. His urge to re-start the Beast came from the album Scarcity of Miracles (Jackzyk, Fripp, and Collins, with Levin and Gavin on the rhythm section).