They may regret it when the battery dies and it's a $20k repair because they're actually structural components on those cars. Or a single $20 sensor dies that's part of a larger non-serviceable $5k component.
That's assuming it's out of warranty, which is now 150k miles or 8 years for BYD in the UK.
The largest other component is the integrated motor/inverter and they should be pretty reliable. They are still repairable, although you might need to replace the entire circuit boards, rather than individual components.
Everything is "repairable" it's just a matter of is it worth repairing. Maybe rebuilding the car every 5-10 years isn't that bad of a model.