Not OP but I type ~140 and there are definitely situations where you feel a desire for higher WPM. Informal writing is the most common one - for example, with this comment I'm basically just typing out what I'm thinking and it reads more like a conversation than a well-planned chunk of text. I'm going nearly full-speed because, like most people in the world, I can compose casual sentences in my head much faster than 2 or 3 words a second. This becomes even more noticeable when you're in chats and just typing as you think of things to say. It's also useful to type faster in settings with repetitive phrases, like coding. There is definitely downtime where you think of what to write next, but it's fairly common to quickly think out a longer segment of simple words and have to wait for your typing speed to catch up before moving on.
It was an an honest question, and I appreciate you taking the time to respond. I can't say that I have ever bumped in to my typing speed limit when writing, even informally, and I am certain my max is well below 140. Different strokes and all that. :)
Written text is condensed. It takes more time to idealize a good paragraph for a written text than the equivalent for conversation. This extra time is used to sort the logic of the text, reducing redundancy in the process.
The parent comment does sound like verbal communication. Even so, I understand the point. I type 120wpm and, when writing, I form paragraphs mentally, then dump them via keyboard. If this second phase could be faster, I'd write faster.
