After all the discussion on the beta forums, they still pushed the 'force' down only one side of the prestige lines unless you want to waste an additional 6 points in the top 4 abilities... a bunch of builds that we've been playing with since we hit 92 are not invalid
I'm disappointed by this as well. While a few classes might mix even with that penalty, it becomes untenable for many others. Net result, each class really only has 2 paths, and depending on their primary content, then its really only one path that makes any sense. Games are healthier when they have more room to define your character. But alas, all those options across all these classes presents a very difficult job for one man to balance, so the removal of options isn't entirely surprising.
I am really unhappy about this. Once again you have to put points into junk to get to what you want. They did away with that in other lines - why bring back a failed design that everyone hated.