it is a LOT better than Manual Guide. FAPT is even better. The problem with the older conversational software is to use it properly you must be a CNC Machinist/CNC Programmer. It has no artificial intelligence. I personally never had a problem with it but I know how to use it (since 1986)
I don't know the story why Fanuc abandoned FAPT/CAPS but I suspect they may have sold the rights/technology to another company (perhaps Mori Seiki for it's CAPS). Or perhaps there was some political things going on.
A while ago I asked our local Fanuc repair guy about it and he just said 'don't ask'