Seriously, why is this even being debated. When furiously trying convince people to nerf fractal, the counter arguments were this:
It's countered by Dune Scorpion
It doesn't work with a full hand
It's expensive.
Mitosis is now the exact same thing, but with none of the weaknesses. It's only weakness is to creature control, and even then, a simple quintessence, or playing it on a strong creature, and that's gone. But by all means, leave it as is. I'll see you next war =)