As far back as 2016, Tesla said all its vehicles have hardware capable of supporting unsupervised Full Self-Driving. Bloomberg/Getty Images Bought a Tesla before 2023? Bad news: your car won't be able to drive itself. Elon Musk said last week that vehicles with previous-gen tech can't support full autonomy. Longtime Tesla owners told Business Insider they felt let down by the company's announcement. For years, Tesla sold its EVs with the promise of an autonomous future. Now, some owners face being left behind . On Tesla's earnings call last Wednesday, Elon Musk said that Tesla vehicles shipped before 2023 — which are equipped with a previous-gen Hardware 3 computer — would not be able to achieve fully unsupervised Full Self-Driving (FSD). "I wish it were otherwise, but Hardware 3 simply does not have the capability to achieve unsupervised FSD," said Musk.…