For context, parts are as available as they need to be. IOW, parts are in stock when they are frequently needed. If a part is rarely needed, it won't be in stock locally.

If you choose a common EV model, like GM, Hyundai, or even Tesla, you are extremely unlikely to suddenly need extensive service. Dealers (with EV mechanics) are common, with multiple in every major city, and a parts network that can have anything shipped overnight.