All the things you say are equally true for holders of passports from any first world country, which the overwhelming majority of people renouncing US citizensh

All the things you say are equally true for holders of passports from any first world country, which the overwhelming majority of people renouncing US citizenship have. And regarding "a lot of money", we are talking Eduardo Saverin levels of wealth here. At that level, if you really really need to make the US your permanent residence again, you can make probably pull some strings and make it happen.