OK, I finally read the original allegation and this is grossly irresponsible reporting. We can put our pitchforks down. The plaintiffs never even claim that the automakers can access your text messages in the first place. This is entirely about the car’s hardware locally caching the messages it displays, some of which could possibly then be read from the cache using specialized and not commonly available equipment.
Is it something to be aware of? Sure. Is something the average person should be concerned about? Not really.
They wanted a new, compact, durable, reversible plug for their mobile devices. There was no industry-standard option that met their requirements, so they made their own. If USB-C had existed at the time, they would have used it (though as a physical connector, Lightning is still just plain better).