If a term doesn't say what it means, it IS weird, not matter what your opinion or the well-covered history is. ^_^
Each format can be defined as FullFrame. Nobody has a copyright or reason to say that 135 film is the scale for everything.
I still have to fill up my 1st 6x9 roll of ISO 400 BW film. 2 out of 8 frames left.
Would I print each frame I have on HD?
I didn't do back in the film times. And your dad, Obican, included scanning costs, archive materials to store the films and papers, he for sure also calculated the increase of costs because films and papers becoming rare, some already disappeared?
Honestly, nobody really would go back to film, it's so much more ado and the quality meanwhile is worse IMO. This calculation is much like how many pair shoes would I need to walk to Moscow instead of using the train.