I never learned to type formally and type fast but with a lot of typos. It is a problem when programming. Particularly the location of special characters, and particularly given that many IDE are "path dependent", i.e. if you type the wrong character and press back, you are not in the state in which you were before you mistyped, auto-complete doesn't reset properly, some auto-format may have inserted lots of new lines and symbols, etc.

To me typing reliably is almost more important than typing very fast.