Why this chef never puts cheese in a sandwich

Max's Sandwich Shop is a cult local restaurant in Crouch End, north London. Here, Chef Max Halley makes gigantic sandwiches costing 12-15 dollars each, and are served as a full meal. 

We tried three of Max's sandwiches, all served in foccacia.

1. "Ham, Egg 'N' Chips", with slow cooked ham hock, a fried egg, shoestring fries, piccalilli and malt vinegar mayo. 

2. "This Is How We Spring Roll", made with pickled veg spring rolls, MSG and black bean mayo, kimchi and kraut, coriander, parsley, mint and fresh ginger. 

3. "The Original Gangster", made with soy braised beef, sauerkraut, caraway, pickled onions, cassava chips and gravy mayo. 

Why does Max not put cheese in his sandwiches anyway? Max is the author of 'Max's Sandwich Book: The Perfect Stocking Filler for the Sandwich Lover in Your Life (even If That's You)'. His recipe book refuses to give instructions for making a cheese toastie, and he describes the idea of sliced cheese as "satanic".

We gave his inventions a try to decide whether we could live without cheese in our sandwiches.