I completely do not agree. I use a keyboard since 10, and I write faster than most people, yet I have a fountain pen and maintain all my personal notes in a Moleskine.

It is hard to me to rationalize it but handwriting enables me to focus entirely on my thoughts, without any distractions, wherver I am. I stumbled upon my best ideas while handwriting.

Personally I even believe that people should be taught calligraphy. It does not make any direct sense but in our attention economy, with constant distractions, it is good to be disconnected for a while.