I (US citizen living abroad) still have to file income tax every year. I cannot contribute to the tax-advantaged retirement plans (iDECO and NISA) in Japan because the IRS considers basically anything they have to offer as a PFIC. I can’t put money into my old US retirement accounts for other legal reasons (and the yen is shit against the dollar right now). You’d better believe if I have to deal with all that bullshit, I’m going to both talk about events and vote.

Edit: to head it off, I’m an only child and need to be there for my parents in case anything happens without any visa paperwork or restrictive periods of stay so renouncing is not currently an option.