And you don't believe you can do the same with an EV? When I test drove the first EV (a Nissan Leaf) I bought, I took an OBD2 dongle with me and evaluated the data after the fact. I was able to confirm the battery health and capacity, the charging rates seen, etc.
With that in hand, I was confident in the health of the EV and made my purchase.
In the future it may very well be possible to do the same home repairs on your EV. We're barely past the first decade of publicly available EVs. A number of early EVs have plenty of guides out there on how to replace and rebuild battery packs on your own, and aftermarket mfgs are starting to produce speed controllers and ECUs for custom EVs.
It's just a new wave of tech, and that too will become normal over time just like ICE cars themselves.