repeating stuff doesn't make it true.
cash bills are actually non-fungible as well (they have unique serial numbers!).
but they're "considered entirely equivalent" because they're NOT tracked on a transparent blockchain that anybody with an internet connection can audit.
if they were, then it would be very important that they have unique serial numbers on them, instead of something that everybody just ignores.
people would hesitate to accept cash that they knew came from drug cartels, banks would look at the history of notes to avoid accepting "high-risk" deposits.
this is a disadvantage of a digital value transfer system over a physical one and why actually understanding fungibility in the real world is important.
instead of the bullshit dogma that you just repeat autistically, encouraging a misunderstanding of fungibility that puts real users at risk.