While the 'Safrole to MDP2P to MDMA' method may involve aluminum and Hg salt, there are many many many methods that do not, like the 'Safrole to Bromo-safrole to MDMA' method, as well as others. Depending on cost, access and laws, manufacturers will choose which precursors and methods to use, not all M is made by that famous process. Palladium chloride is very expensive, dimethylformamide is getting to be more rare, although could be substituted with methanol, and there is one step in amalgamation that some would say is touchy and unsuitable for mass production. I don't think that method is used often in large scale production.