JFVC as pointed out is not a type of APRC nor same as APRC. It is important to make the distinction clear.
As said, the JFVC is valid while your spouse is alive/as long as they do not dump your ass. Ehile it shares the advantage of Open Work Permit Rights, you will always be one blue truck/one cancer/one family spat away from losing all: residency, work, home, kids. Hence, JFVC is not “permanent”.
With APRC at least you get a fighting chance. You can stay on The Island not depending on having a job or being married. If you hit the lottery and have an APRC, you can get a nice cabin by the woods or live on a shack by the beach, scratching your balls and having beer/writing the definite Taiwan novel..whatever. Or set up a taco stand in a night market if you do not hit the jackpot. You can do whatever you want. Oh, and they call it permanent because even though you renew the card every 10 years, aside from a recent picture, no further paperwork is required.
Ultimate freedom, as in having your own nice loan/any and all credit cards/other perks however can only be achived with nationality of ROC.