I cannot disagree about being wary of Tesla . . I certainly am. Here's an article about data from 6,300 EV's from 12 manufactures. Also includes a cool graphing tool . . . https://electrek.co/2019/12/14/8-lessons-about-ev-battery-health-from-6300-electric-cars/ Graphing the data: https://storage.googleapis.com/geotab-sandbox/ev-battery-degradation/index.html

As for my own EV's . . I was an early adopter with the 24kWh Nissan Leaf - only had about 65 miles of "real world" range. Didn't keep that long and traded it for a VW eGolf . . . 125 "real world" miles. Had that for several years . . .but traded it early in 2023 for a VW ID4. With 300+ miles, I no longer think about range. None of them had/have more than 30,000 miles . . .and I never noticed any degradation at all. The impact of cold weather is a MUCH more more noticeable issue!!

A few things to casually point out:

EV batteries are mandated by law to have an 8 year, 100K mile warranty. It's fair that you'd want it to last significantly longer, but if these things were built to go kaput immediately after with very little buffer from the warranty period, you're risking a lot of "below average" batteries having to be replaced under warranty - not to mention the reputation of these companies being absolutely shot as they ramp up EV production if they all went out immediately after.

Most modern EV batteries are built with a battery management system. Basically a heating and cooling system and such that you don't see in consumer electronics very much, meant to keep the battery system happy and healthy. The biggest exception to this is the Nissan Leaf, which is based on painfully outdated designs that never really improved from when they first came out almost 15 years ago. Many of those cars have cooked batteries and you would be right to be concerned about it.