Imagine you had a tool similar to those ChatGPT IDE auto-complete plugins, except instead of doing chat GPT it typed what was in your mind.
Imagine you start work in the morning, and there is a 0ms response time from what you think, and huge blocks of code would appear instantly.
Is your work such that you TRULY only type 300 words per day? Or, do you also... write tests, write boilerplate, write for loops you've written thousands of times, write and read files, call/build APIs, write command line tools.
If you can imagine some kind of "instant feedback" typing thing quite literally not improving your quality of life whatsoever, then I guess you are just in a rare boat. I can't visualize any circumstance where 80WPM typing would not benefit them, but I suppose there might be a world of developers out there who truly live in a vaccuum like one of my other comments said... they just come in to work, dont communicate with anyone, dont write anything other than a 50 line file with a few hundred words in it, and leave after 8 hours)