Okay, so adding fractions works by using any common multiple of the denominators, not just the lowest... Doesn't seem ground-breaking and, frankly, what's the point?
Firstly students will also learn how to find the LCM of two numbers anyway.
Secondly, they need to simplify the fraction, which requires the notion common factors and it's not something that comes easy to them
Thirdly, if you try doing that to algebraic fractions or higher number fractions using this method, you'll get in trouble quickly...
Basically, uninteresting, a very particular case and not useful...
Sorry...