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...