Not at all. It is simply because the tip of a quill and the nib of a traditional[1] fountain pen cannot move in any direction. The way you hold it if you are right handed forbids moving in the "backslash"* direction[2] upwards. You can "draw" from top down but not "shove" upwards in that direction. Since in joined script we start letters mostly from the baseline (and have connecting strokes) this makes the "right leaning slant" much easier to write.
The anatomy of a right handed writer also plays a role. When you write fast, the hand pivots at the wrist and fingers as it moves rightward, and that produces a forward slant.
[1] Modern fountain pen nibs have a little ball at tip. So even if you used on in primary school you might not have noticed the directional effect.
[2] That is why the slash (virgula) has existed for centuries while the backslash is an invention of the computer age.
Also, when left-handed writing became accepted, there were special left handed pens (with a broader tip that you can push forward without it ‘biting’ into the paper)
Finally, how do you know nobody did that, and got harassed for writing incorrectly?
Left-handedness is somewhat associated with mirror writing (https://pmc.ncbi.nlm.nih.gov/articles/PMC2117809/:
“Particularly when produced spontaneously, mirror writing is a highly heterogeneous phenomenon: the mirroring may range from as small an item as a single reversed letter, through numerous reversed letters but not words, to thousands of pages of mirrored script; the place in the word in which a mirror letter occurs is variable, and numerals may or may not be reversed too”
Except for writing, for everything else requiring skill he used his left hand.
its still a very unnatural action to do when writing, compared to a backslash
> Finally, how do you know nobody did that, and got harassed for writing incorrectly?
The parent asserts that it was invented for computer use, not beforehand. If a left handed person does it, its been invented beforehand
“What may be the first documented reference to the character is a 1937 maintenance manual from the Teletype Corporation, which includes a photograph showing the keyboard of its Kleinschmidt keyboard perforator WPE-3 using the Wheatstone system. In a 1945 document, Teletype used the name "diagonal key" for the symbol, and gives it a (non-standard) Morse code of ._.._ . Neither document gives its usage”
> If a left handed person does it, its been invented beforehand
I disagree. A left-handed person writing a slash in mirror image doesn’t write a backslash; they write a slash using a different glyph.
Having operated an old engraving machine and software I would have assumed it was a lack of effort in line spacing. Some of that old software was very primitive as it was a XYZ engraver which operates like a cnc from an origin point, each line needed an new origin offset you had to specify per-line. That happy mistake is when someone sets the line spacing to the font height.
https://aresluna.org/the-hardest-working-font-in-manhattan/
Discussed https://news.ycombinator.com/item?id=49201953 .
A long read but well worth it.
Personally, I (guiltily) love using ol'fashioned contractions. I wish it were more normalised.
However, when people write Yiddish (which has a right-to-left script) they slant the same way[^1], whereas you'd expect the opposite if it were easier, so maybe it is just arbitrary.
[^1]: An example of Yiddish handwriting https://en.wikipedia.org/wiki/Yiddish_orthography#/media/Fil...
