Robert Caro handwrites to slow down

Claudia Dreyfus interviews Robert Caro, the author of the monumental biography of LBJ, for NYRB - I found this bit fascinating:

Is it true that you write your books by hand?

My first three or four drafts are handwritten on legal pads. For later drafts, I use a typewriter. I write by hand to slow myself down. People don’t believe this about me: I’m a very fast writer, but I want to write slowly.

When I was a student at Princeton. I took a creative writing course with the literary critic R.P. Blackmur. Every two weeks, I’d give him a short story I’d produced usually at the last minute. At the end of the semester, he said some complimentary words about my writing, and then added, “Mr. Caro, one thing is going to keep you from achieving what you want—you think with your fingers.”

Later, in the early 1960s when I was at Newsday, my speed was a plus. But when I started rewriting The Power Broker, I realized I wasn’t thinking deeply enough. I said, “You have to slow yourself down.” That’s when I remembered Blackmur’s admonition and started drafting by hand, which slows me down.