A Truist Securities analyst took a Tesla Model Y out for a ride to test its Full Self-Driving capabilities.Sjoerd van der Wal/GettyTruist analyst William Stein tested Tesla's Full Self-Driving and said it still lacks full autonomy.Stein said he had to make three interventions, one of which would have led to a "certain accident."The analyst said he is "befuddled" at what Tesla will show at the Robotaxi event.Following Elon Musk's bold assertions about "solving autonomy," a Truist Securities analyst took a Tesla Model Y out for a ride to test its Full Self-Driving capabilities.In a note seen by Business Insider, Truist analyst William Stein said the technology was "arguably worse than last time." In its last review, Truist characterized FSD as "stunningly good, but not useful today.""In our opinion the newest version is still stunningly good, but does not "solve" autonomy," the analyst wrote in the note about the latest version.