[hackernewds]

why would pens perform different for right vs left? they're asymmetrical

[bluGill]

In left to right languages lefties are draging their hand across what they just wrote and so need something that dries fast or it smudges. I suppose right handed hebrew writers would have the same issue (are their other bidirectional languages? )

[aljgz]

Arabic, Persian.

[valbaca]

Mostly because of smearing and the direction of writing: left-hand writers "push" the pen more, while right-hand writers are "pulling" the pen more (not totally and not 100%)

[teecha]

The whole language is against you. Writing with your left means you can smear everything unless you do some odd maneuvering with your wrist.