My sister, despite not even having complete her masters yet, is the leading CRISPR-Cas9 person in my country, and was sent to MIT to improve her technique. You

My sister, despite not even having complete her masters yet, is the leading CRISPR-Cas9 person in my country, and was sent to MIT to improve her technique. You are completely correct, in fact one thing that was notable about it was how much work intensive it is, she was forced to miss lots of family events because she had to go in the lab work on the cells, it requires lots and lots of manual labor. That said, the stuff IS awesome, after you figure how to get it right, it can get right a lot. (but she did this with animals, where she CAN attempt trial and error until she figures the right reference gene sequence to use to guide the proteins, I dunno how that would work when you are racing against time to save a live patient for example, specially if you want to edit his heart or some other area that is hard to access). By the way, one of the motivations of MIT new variations of CRISPR (that don't use Cas9) is that Cas9 technique require big needles if you want to work in a living organism, the new ones would allow you to use much smaller needles, that are more practical to stab into a patient... and it is very forward thinking, because people didn't even tried stabbing CRISPR needles into someone yet, it is just that MIT guys realized it would be impractical with Cas9 and decided to invent another technique before actually trying it.