On the flip side of this, I type at 130-140WPM and never learned to type “properly”. I use my index fingers.
So I understand that there is a lot of people who are much more naturally agile with their hands.
But I still think learning to type properly has huge advantages. Even if you dismiss every other advantage (say you decide you don't need to type fast), I think it just feels extremely satisfying to be able to focus on anything you want while your hands just produce constant stream of characters on the screen in a flowing, effortless motion.
Even in ideal situation where consecutive characters fall are alternating between left and right hand, that gives 5-6 characters PER SECOND for a single finger to type.
This guy does it: https://www.youtube.com/watch?v=c9psfOxJysw
But it does not look comfortable or effortless at all.
Add to it that you have to look at the keyboard instead of comfortably focus on the screen, you are straining your hands, your eyes and your neck.
So you still loose.
It is a gimmick, there is no way you can work like this hour after hour, day after day, year after year. Most likely this is some kind top speed you can technically reach, but you will not be able to sustain.
I don’t look at the keyboard to type with two fingers (and my thumb, technically).
I can probably sustain 120 effortlessly. 130-140 if I’m comfortable.
I’ve been doing it for nearly two decades and haven’t had a problem.