Once again, you’re reading things into my posts which just aren’t there; the terms I actually used were “different approach” & “different standards”. The methods I use are a result of my background knowledge & personal experience but they are broadly consistent with the many guides available &, in fact, less onerous than some, including the Tiling Forum sticky.
If you take the time to read what I’ve actually said, the way we do things isn’t that much different;
• You use 6mm ply for over boarding, I use 12mm, some recommend even thicker!
• I don’t like chipboard & given the option, I always prefer to take it up if only for the reason that over boarding (12mm) creates what can be a considerable difference in threshold height once the tiles are laid &, in many cases, folks simply won’t accept that.
• If I do overboard, I always screw through into the joists for the reasons given but you do have to be really careful to locate pipes & cables; I will admit this could be a problem for some DIY’s
• I never use nails always screws as there is simply less chance of them loosening or pulling over time
I really don’t see why you seem to be getting upset by it; I know one tiler that nail guns 3mm hardboard over everything regardless & tiles directly onto that
As I said, it’s down to the individual to take advice on-board & chose their own way. 