Reminds me of: Mommy, why do
you always cut the ends of the roast off before placing it in the pan? Go ask grandma...I learned it from her. Grandma, why does mommy cut the ends off the roast? I have no idea...I did it because my pan was too small
I see it like shifting from reverse to drive or 1st without coming to a complete stop. Its not not going to grenade your transmission, but makes it's harder on it than necessary.