Re: @Stork "what about our dual nationality children"
" It hurts only if you live/work in a place with lower taxes than your own country, [...]"
It is my understanding that many people are in the IRS tax net either because they are US citizens who live abroad - or they are foreign nationals who recently worked in the USA.
A common complaint seems to be that they have to incur significant professional expenses in compiling the mandatory return for the IRS - even if there is no tax to pay.