I was talking with a professional transcriptionist who said she could
get better speed on the old selectric typewriters, or even old manual
typewriters  than on a modern keyboard.  I wondered why.

I came up with two reasons. The old mechanical key had a great feel.
The travel was short. The keys had a definite click to them.

The other is, with a traditional typewriter, your eyes look at the
same spot all the time to proofread.  Today the spot where the type
shows up can be anywhere, and you often don't get to see what you are
typing in context, especially for inserts. Further the fool cursor
often obscures it.

What would happen if you emulated a typewriter when editing?  The
cursor would stay still and the screen would scroll.

Perhaps doing that fully for vertical scroll and partially for
horizontal scroll so that you always showed at least a 3/4 of a line
on screen.

It might be unnerving at first, it would be interesting to see if over
time it would speed up you typing.

I vaguely remember using some program on the old Apple ][ that worked
that way, Visicalc?