Why is there a need to?
I’ve been wondering about your posts. It seems more like you’re trying to undermine the EBTs than understand them. If you are trying to understand them, you may be overthinking them.
Let’s say ‘The Compendious Book on Calculation’, a highly influential treatise on mathematics, was found in a cave somewhere, and it was attributed to Muḥammad ibn Mūsā al-Khwārizmī, who is historically known as the author. Should the knowledge in that treatise be disregarded if there was no way to verify every narrative attributed to it, or verify Al-Khwārizmī’s existence or gender? Of course not.
This same logic should apply to the canonical Buddhist texts. If the practices drawn from them have been shown to have actual benefits, the cursory details don’t require explanation. For many questions, we can only endlessly speculate, which would defeat the whole purpose of practice.