You need to come back? Better be ready for your visa to get lost five times and a random 6 hour interrogation at the border.
It's easier to get into the US on an Iranian passport than on a UK passport when you've given up American citizenship.
Article is probably focusing on 10mil+ net worths at least, but likely "UHNWI" which are 30 mil+ who have time to think about this stuff.
People are getting second passports as a fancy object, and to avoid discrimination in countries where anti-Americanism is popular.
If your assets are under 2mm, or if super liquid and thus easy to pay the exit tax, you have a pretty decent option.
Otherwise, the exit tax can be addressed on a scale of multiple years (Puerto Rico has 0% capital gains under act 60, exemption from federal under irc 933, so move to PR first, realize capital gains, have no unrealized capital gains subject to exit tax when relinquishing...)
I'm not a lawyer; not legal advice, or financial advice, entertainment purposes only.