I mentioned those games because they are also 3d crpgs unlike the games that you have listed. This isn't anything innovative. With the pre-rendered 2d engines of the games that you have listed, having a "select all" party movement would be the default. With a 3d engine, a "select all" option would play just like it does now with the same AI pathfinding issues. Simultaneously controlling all 4 characters in a 3d game would still have the same issues that you're describing.
That's why I'm asking what you would offer as a possible solution to this. From what you're describing, the problem is with the AI. Not the movement system itself.