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I know it's not the question asked by the OP, but as @Patent says it is useful to have some friction braking to prevent rusting/glazed discs and pads.
When we had the 225xe the braking became rather poor due to surface corrosion/glaze, despite having fairly mahoosive front discs.
After half a dozen hard braking episodes from 70mph to almost stopped the braking performance was noticeably better for a couple of months.
The car was mostly driven by the missus on her urban commute in EV mode so I suspect friction braking would have been near zero compared to regen.
When we had the 225xe the braking became rather poor due to surface corrosion/glaze, despite having fairly mahoosive front discs.
After half a dozen hard braking episodes from 70mph to almost stopped the braking performance was noticeably better for a couple of months.
The car was mostly driven by the missus on her urban commute in EV mode so I suspect friction braking would have been near zero compared to regen.
