As someone intimately familiar with battery technology, modern batteries will degrade at a rate about one half of that of what you see now on 10-year-old EVs (which hold ~80-85% of their max capacity). And cobalt-free LFP batteries barely degrade at all, they have projected lifetimes of 20-30+ years, and are in all standard-range Teslas among others.

And they continue to work even after they have degraded that much, they will go on to 70, 60%, often even 50% capacity before they start dying off. I wouldn’t be surprised if the Taycan still has a decent useable battery capacity in 20-25 years.