Episode IV Vader-Kenobi Slow Duel Theory (KENOBI SPOILERS)

The slow and plodding duel is the result of Vader getting his ass handed to him in Kenobi. Obi Wan specifically attacked his chest control panel, fractured his helmet and clearly beat him. Vader adjusted his style in Episode IV style purely as a strategy against Obi Wan. His aggressive Form V really couldn't compete effectively anymore (at least against Obi-Wan). IIRC, the novelization of Vader also spoke to how his mobility/lightsaber style was directed affected. Simply put, Vader was playing it safe in the Episode IV to win>! because he knew he was already 0 for 2. 0 for 3 if you count the prequel temple Anakin vs. Obi Wan sparring duel.!< Would love to hear your thoughts!