I dread those moments of notational and metrical irregularity though - I think editorially resolving them satisfactorily costs the most time.One plus is I know what figurations my hands naturally gravitate towards!
Improvisations, by their very nature, of ephemeral and 'of the moment'. This doesn't mean they don't have artistic value- but there a just once-off. They have a unique capacity to respond to the moment, but seldom stand up when notated.And notating them down doesn't make any sense. For one thing- it's a huge amount of effort...it would take weeks to notate, and then take up so many pages, and then be almost impossible for anyone else to play. Why bother doing this, when it would be infinitely easier just to toss off another improvisation?
I suppose it all depends on what we as individuals consider ephemeral. I have difficulty in describing recordings of improvisations by Jelly Roll Morton, Keith Jarrett, Cecil Taylor, Marilyn Crispell, Chick Corea and many others as musically or artistically transient, as even in the purely historical, social or statistical sense this is contrary to the observable facts. The recordings, the sounds, are themselves perfectly viable artistic end products without need of visual representation. So in that sense I disagree but I do agree that the functional processes of creating written music and improvised music, while overlapping in some areas, are essentially disparate. The pragmatic difficulty of converting one to the other is likely not germane to the much deeper issue of the lasting value of either.