> Do you think MDMA just breaks down completely devoid of methamphetamine as a metabolite?

AFAICT, that is correct; why do you think it doesn't? Name-based intuition?

Every reference, paper, etc., I can find of MDMA metabolites does not identify N-methylamphetamine (“methamphetamine”) as a metabolite of MDMA, and every identified metabolite retains the two oxygens of the methylenedioxy unit (whether it retains the whole unit or not) that distinguishes MDMA from methamphetamine.

Yes, MDMA doesn't break down into methamphetamine. They are different drugs with different metabolites and metabolic pathways.

MDMA breaks down into MDA, HMMA, HMA, DHA, MDP2P, MDOH.

Not sure why you have to insult someone in this discussion?