rb99:
I think its idiotic because, although it was a few years ago, they did something similar in the UK with ordinary tax disks (or whatever they're called), not RUCs. The result was lots of fines for people who could no longer check whether they were up to date using the simple method of looking at the date on the paper in the windscreen. It also doesn't require an app or t'interweb to check, assuming its working the day you want to check it.
I was thinking about this very thing this morning. As a pedant, I regularly look at the “pieces of paper” in the windows of all the family cars. A little bit redundant in the case of WoF and Rego because I get email reminders (easy because they’re time based).
What would be good is if car manufacturers that have Apps associated with their cars would allow you to set mileage reminders in the App.
The Tesla API is beyond me but I’m sure someone could come up with an App to help with reminders.