LOL. There's a reason it's called death and taxes.I'm completely unsurprised. On top of that, they probably don't want to have Uncle Sam's tentacles too deep into their finances, especially if their Significant Other is not a US citizen/PR, yet still has to share banking information with the IRS. Far from ideal.
Originally it was to shame the multimillionaires that were renouncing for tax reasons. As usual, it was never temporary and became a staple, just like FATCA/FBAR, which doesn't bring in that much revenue compared to the excessive heartburn it causes thousands of families across the globe that have never set foot on US soil. I seem to recall reading somewhere that expats were the second-largest voting bloc; I forget who was first (or even if this is still true, due to declining expat numbers) ; it would be nice if we could get someone to listen to us and move like the rest of the world on ending citizenship-based taxation (sigh.. I know it's a Sisyphean task, but a man can dream, right?)
“Ours is not to wonder why. Ours is just to do or die.”
― Lord Tennyson Alfred