60K in 10 years is not very expensive if you didn’t have to pay for the digging itself. That could easily be as expensive without any service. Now I don’t know what happens after your current contract though, whether it will be reduced or if you have options to switch providers…
The example of driving from Paris to Mt St Michel where you have to plan carefully to get to ‘the only supercharger’ east of Paris is a bit stupid. Why not charge at Total, Engie, or even Lidl? I assume Teslas are not exclusively charged at superchargers, which can be pretty slow at 150kW when there are 300kW options as well.
A good and in France rapidly improving charging network is important, swapping batteries sounds nice but brings so many compatibility and standardization issues, not considering ownership/lock-in etc.