I cant argue with someones’ nan’s facebook feed telling them outright lies, but there is a hell of alot of misinformation being peddled - and not just from anti-EV people. Some very pro-EV people also talk total shit. If you havnt considered it, why not?
Unless they adopt the cell phone model and just make you trade the car in.
Someone at the end of those trades has to do the replacement, which will dictate second-hand car value.
BTW, batteries wear gradually, and a battery with 70% of capacity may be annoying for a car, but is still valuable for stationary energy storage (for solar). To me that’s another optimistic factor that can reduce actual replacement cost.
They will not pass these savings onto you.