Is typing with 2 fingers dangerous?
Depending on how much typing you do, you could be facing more serious injuries by typing with only one or two fingers. The same amount of typing spread out of two wrists and 10 fingers are going to cause fewer injuries than if you do it all with just two fingers. Repetitive injuries are bound to occur, and you could end up being unable to type while your fingers heal. You also are less likely to incur a neck injury from angling your head down to stare at the keyboard while you type.
Community Moderator at Typesy
Using two or three fingers to hunt and peck takes much longer and allows for the development of bad habits. It is much better to keep your hands still and allow for efficient use of all fingers. Touch typing involves the specific placements of all eight fingers and both thumbs; once muscle memory is strong enough, this style allows for the typist to focus on the screen rather than the keyboard.
Alex (The Reimagined Classroom Teacher)