I had the same issue as a kid. I was left-handed and my mom -- who was only 20 at the time -- was convinced by various professionals of the time (1970's) that being left-handed was bad so she converted me to a right-handed kid.
I am ambidextrous, but largely do thing right handed as a result. I had a really strong arm growing up. I could throw a football 65 yards and was once clocked at 92 throwing a baseball, but always wondered if my left-arm would have been even stronger had I been able to develop it growing up. I often tease my mom that she might have cost me a career as a left-handed pitcher in the majors since they are so coveted.
WRT Tua's arm strength, I continue to assert that it is a false narrative. His arm was never a problem at Alabama. He did lose some strength and torque due to the hip injury, but I think he's got most of it back now. Would he be better as a right-hander? For all we know, perhaps his accuracy or motion wouldn't be as good. We'll never know for sure.