If you spend your life sitting in a chair, that's fine. I tend to get all kinds of ideas, questions, and research needs while I'm walking around. Typing a paragraph or two or context takes too much time and is very risky. Especially when driving. But also just walking, cooking, cleaning, etc. Sometimes it's just not practical - winter, carrying stuff... I mostly feel privileged if I can just sit at a computer and type my question and have the time to read the answer.