Sometimes you are forced into the ulnar deviation for other reasons.

For example:

- I have long arms (6'3" fingertip to fingertip)

- I have bad vision (20/40 is best I can get even with glasses)

- B/c of the above I like to have the monitor close to me (or I sit closer to the monitor)

- For a long time (5 years) I worked on a trading floor with a desk with very limited depth so my wrists were often turned inward

So I ended up getting a split keyboard (Kinesis Freestyle) so I could spread my hands farther apart so I didn't get the ulnar deviation.