It depends really. If they manage to create an environment where 2-3 builds are very close to each other competency-wise then that means there are 2-3 different ways to specialize stat-wise. More than that would be stretching it, and even having it be this way for every class/job is far-fetched, but not impossible.

That would have to mean there would have to be different ways to use the actions too I think or at least the actions would need to have various special characteristics you could enhance through the usage of different stats. Otherwise surely the community would figure out only one correct build which everyone would have to use. We need to have different options for this to work.

It is true that manual allocation is not very optimal system in the sense that for proper specialization there is a lot of work to be done on the community side, and it is easy to "screw up" at least in theory. However it is not entirely without benefits and it can provide means of meaningful specialization. I think the most important issue they will have to avoid is to not penalize players for doing it "wrong", so the requirements for re-allocating should probably not be too strict. In that way I find the old re-allocation system to function quite well in this new environment where builds are class-specific. It was too restricting in the old system, but it would make more sense the way the current mechanics are set up, as it is doubtful that you would ever have to re-allocate a lot if not all points at time.

So at the end of the day the manual allocation system will make us work a bit too hard for results that may not be worth it but the benefits are there, so it is not a completely useless system, just inefficient. One thing to remember as well is that the Japanese community works in an entirely different way to the Western community in that they are far less likely to impose restrictions on their players based on competency. As long as you can do the job properly you are free to allocate points and choose abilities as you wish. They will gain far more from this feature than we will.