are there any composers who still do their musical scores by hand?

Stockhausen used to compose on enormous sheets of paper pinned to an architect's drawing board. Reducing that to something a performer could put on a music stand was Somebody Else's Problem.

Brian Ferneyhough has made deprecating comments about computer notations homogenizing what can be expressed. Good luck trying to computerize this:

Unity Capsule 1
Unity Capsule 2