Out of interest, how much did you sell it for?
I guess your buyer plugged in a dongle and read health on their phone using LeafSpy?
My 2014 Leaf Tekna with ~64k miles on the clock has 79% state of health when I read it last month. Not bad considering over last 12 months, the Leaf had its battery depleted every single day as I was using vehicle-2-home, essentially using the vehicle battery as home battery, time-shift most of my home usage to 7p/kWh overnight.
Yes, the exhaust is clean compared to less well maintained vehicle. But it is still putting out huge amount of toxic gas at street level. Put it another way, would you be happy sitting with the engine running in a closed garage for 50k miles worth of time? My guess would be no, but it's okay for other people to breath it in for your personal travel benefits.
The idea that battery manufacture produces a lot of emission needs re-visiting, it is a tiny number compared to vast amount of pollution from ICE during use.
The idea that EV moves emission to power plants is also no longer true, as UK shutdown its last coal plant in October. Every mile driven today in my 10 year old Nissan Leaf is cleaner than 10 years ago. This is key advantage with EV's, it gets cleaner as grid is cleaned up.
The idea that EV batteries will need replacing also not true. It's not true for my 10 years old first-gen EV, it is more false for latest battery fitted in modern vehicles. After life in vehicle, the battery can then be re-used in stationary applications. Finally, many years after re-life in stationary battery, they can be recycled.
EV whole-life emissions calculator:
https://www.iea.org/data-and-statistics/data-tools/ev-life-cycle-assessment-calculator
coal shutdown:
https://www.bbc.co.uk/news/articles/c5y35qz73n8o
EV battery re-use:
https://www.autocar.co.uk/car-news/...es-power-dutch-stadiums-energy-storage-system
and:
https://www.bloomberg.com/news/feat...ic-vehicle-batteries-will-go-when-they-retire
Battery recycle:
https://www.redwoodmaterials.com/ (current supply is not enough for mass recycling)
Personally, I view biggest benefit with EV is ability to power home (I'm using V2H right now) and become an inverse of virtual power plant (VPP). The latter can soak up excess cheap renwables so that enables more renewables to be built making electricity even cheaper. This is why home tariffs like Intelligent Octopus Go exist, you provide the sink, helping Octopus to balance the grid.