Free form paper still fills in the gap where computers/tablets/phones are too cumbersome and just slow the process down.
Sometimes the simplest tool happens to be the most effective tool (paperless office hasn't fully happened yet).
Another aspect to consider is the process of writing often leads to insights that you may not have stumbled upon whilst using a keyboard/touch screen for writing the same message. This may be due to the speed of writing relative to the speed of creative thought. It may also stem out of less distractions encountered during the paper writing process vs a busy computer screen.
Sometimes the simplest tool happens to be the most effective tool (paperless office hasn't fully happened yet).
Another aspect to consider is the process of writing often leads to insights that you may not have stumbled upon whilst using a keyboard/touch screen for writing the same message. This may be due to the speed of writing relative to the speed of creative thought. It may also stem out of less distractions encountered during the paper writing process vs a busy computer screen.