I've read the threads and I'm not particularly convinced. The main arguments as I recall them were:
It's heavily luck- or skill-dependent, you can't plan for it: It didn't feel like luck in the movie. Holdo executed the maneuver (on her own, without any bridge officers, mechanics or other personnel!) relatively calmly and Poe knew what she was going to do the moment he saw it.
It only works at a range where you can be shot at by enemy guns: So does almost all space combat when it's actual combat rather than a turkey shoot.
It's extremely ressource-intensive: No, one cruiser against a fleet is an absolute bargain (as long as you can afford to lose that cruiser).
It's unethical to implement this on a larger scale due to the necessary human sacrifices: So use droid brains and call the whole thing a large missile rather than a ship.
But we can certainly agree to disagree there. For me, it's a flaw among a number of flaws in a mostly great movie.



