To an extent, but not to that extent.

There's a significant difference between (say) 20wpm and 100wpm. -- Your comment is 150-200 words; so that's the difference between spending two or three minutes vs ten (just typing it out, not counting the time it takes to think).

If you limited your typing throughput to 10wpm, how long of a comment are you really going to reply with? Probably not a long one. -- If someone types at 160 wpm, are they going to type a better comment than someone typing at 80 wpm? Maybe? Maybe not? Probably not twice as long / twice as good.

I still think "typing speed is about latency, not throughput" is the key perspective. (Followed by diminishing returns. I think around 80wpm is fine). -- There are some cases where I'm doing the activity so infrequently that the cost of improving outweighs any benefit I'll see.

There is a thing about getting to 120 though. Like, being able to connect at that speed with everything working perfectly in sync.