Very good writeup! Beyond the face value that, yes, we are told on screen that Newsome is actually playing a 1000+ years old Dax, you made it make sense 🙂

Since we're in the DS9 lore here, I need to address your suggestion that

the reason most symbionts choose to not live to 800 years is that they get bored

Would you say that perhaps they are teaching their cells new mitochondrial tricks? Please, don't let this leak to the soulless minions of orthodoxy that try to suppress the truth 🤣