This is the sort of issue that leads to calls for more regulation. Perhaps all EV manufacturers should be forced to disclose metrics related to battery life, such as coulombic efficiency which has been shown to be a proxy for how rapidly a Li-ion battery is likely to degrade.
they could provide it and the 3 people who would read it would undoubtedly come away with more insight...
but as we all know; charts and graphs will do nothing. Nissan put out a chart that was actually quite realistic (if you could find those driving conditions that is...) and it did nothing... Very few knew about it and even less could extrapolate the data into their personal existence.