I mean the commonly accepted standard film size; from which popular contemporary consumer photography standards are derived:
Film 35 mm wide with four perforations per frame became accepted as the international standard gauge in 1909
From this the reference focal lengths and concerned fields of view are derived and came to be *commonly* known.
A camera system; with a medium below this standard size – is specified with a numeric ‘crop factor’.
Take this factor. Apply it to the mm focal length of your lens (marked on *every* lens).
The resulting figure is then *commonly* accepted as a specification which describes the field of view.
If you are genuinely trying to suggest otherwise, or that folk buy lenses marked in degrees – it seems disingenuous.
Semantics aside, your practical recommendation for portrait appeared to be the same as my related experiences – and many others – so we may in fact agree!?
In which case – If I misunderstand your intentions, or I have failed to understand the point you are trying to express – I apologise.