Unicode is a disadvantage for someone who wants to contribute to your code. That person now has to figure out how to write down Unicode arrows, taking her/him out of her/his flow.
I'm not sure if you're sarcastic or not. However, I'm Dutch, and we have similar tokens.
Nobody minds if you write Danish code, but if you like contributors, it is asking a lot of them to change their editor or tools to collaborate with you. I hope you didn't mean your collaborators have to adjust to you like that.
Not at all; the point is that a Dane isn't actually taken out of their flow to type ø in Danish, because they're using a suitable keyboard layout. Likewise a programmer need not be taken out of their flow to type (a→t ≠ 0) or a ← b ∧ ¬c or (2=0+.=T∅.|T)/T←ιN.