This is increasingly many cars, starting minimum in the past decade and an half, and not limited to EVs. It's definitely something you need to research before purchasing one so you can dodge the worst offenders. Automotive engineering has been a clown show for years, and greatly suffered from becoming too reliant on digital technology without being willing to invest and spend for robust systems, going for low-cost, low-quality, proprietary parts made in small numbers and unique to each production run. The traditional expectations that you could have options in regards to your vehicle being serviced are on their way out without consumers doing something about it. A future where only the manufacturer and its authorized shops can perform maintenance means they can set any price for it, a price that's already been skyrocketing, and that would effectively allow them to collect far more revenue than previously possible.. and if you can't extract value from customers through heated seats and high-beam subscriptions, maybe you can just have their cars full of black boxes break down more often?