I have a roll bar. I am a safe driver. But that does nothing for me if I spin and someone tbones me or vive versa. Random failures happen as well. You can't expect to never have an incident. I'm not sure that it's a good idea to cage a car that will be on the street too. Cages in miatas mean bars near your head and no helmet on the street.
Not sure what I'll do, just thinking it through and trying to determine sti's dependability as a track car that is also a dd.