Many of my relatives were subjected by their parents to a "training process" to "prevent" left-hand-dominance. This method started at a very young age and basically consisted of politely instructing the child to switch hands whenever they reached for an object with the left hand. Now, as adults, everyone that went through this process—most of whom admit that they are genetically left-handed—uses their right hand for almost all tasks. Some have even developed ambidextrousness, which I guess is an added benefit.
Now, as my young daughter is reaching the age where this "process" should start, I wonder if I should resist my family members' suggestions to do the same for her.
All of the parenting advice I've found on the Internet (e.g., pages like this) claim that forcing genetically left-handed children to use their right hand is bad. Most of their arguments, however, take the form of, "It isn't so bad to be left-handed, so why resist?" Or pseudo-medical claims that forcing right-handedness will conflict with the child's left-vs.-right brain dominance.
Is there medical/psychological/scientific evidence on whether forcing or re-teaching handedness is harmful vs. beneficial to a child's development?
I am not looking for opinions on whether it is a good idea to do this to one's child; that's why I'm asking this here as opposed to Parenting.SE.