Well, the film canister being made of metal and being conductive, and being so small, it warms up in 10 seconds in my hands.
The film itself, the acetate or whatever plastic it is, really doesn't hold cold or heat.
Now we're down to the emulsion: Its thickness being measured in microns, it too can't hold moisture for more then a few seconds.
Arguing makes no sense. Just take out a roll of film in the freezer, hold it in your hand for
15 seconds then bring it to your cheek. Still cold? If still cold, wait 5 more seconds.