What does seem unique is the obligation to pay income tax living abroad.

It seems to make no sense to have a say if you aren't going to pay for anything.

My Aunt moved to Australia 60 years ago. She should vote how my tax is spend? She had a very busy life, she should make time to watch dutch propaganda TV? She also doesn't like the idea of being counted as someone who didn't vote.

We likewise have lots of immigrants who vote in their "home" country they don't live in or never did.