its logical to write with whatever hand you were born to write with.
Forcing a left-handed to be right-handed causes reduced activity in the dominant right hemisphere and increase activity in the non-dominant side. Since creativity and imagination are dominant parts of right brain, they will remain under-developed and the left-side of the brain sees increased activity that deals with reality, facts and logic … characteristics that are opposite of the person’s true potential. The consistent use of non-dominant part of brain affects the personality while growing up and the adaptability can be difficult. Forced right-handers have to work a lot harder to improve handwriting, take more time to adjust in using tools like scissors and knives, are unable to perform better at activities (like sports) than natural right-handers, get tired easily and may even have language difficulties due to possible dominancy conflict between the two halves of the brain.
Hey, walking backwards might spur the creative juices too, but it’s a disadvantage to walk backwards because you can’t see where you’re going. Just like you can’t see what you’re writing when you write with you left hand unless you’re writing in Arabic or Hebrew.