The difference is that Millennials seem to be disproportionately tired of responsibility while Boomers hoarded it. What sort of Millennial wants to go through the effort of maintaining a home owners’ association or of showing up at town halls to complain about new developments? Just give us some mtg cards and a runescape membership and you can have the White House.
Abrogation of responsibility is still messy selfishness, but it’s easier to work around for people who do want to be productive. Those in power are more than old enough that Millennials not replacing them in large enough numbers means reasonably middle-aged Zoomers get those positions instead.