The personal website never went away, but for about a decade it stopped being the obvious place to put anything.
What changed
Not the technology, which was always available and always cheap. What changed is that the alternative stopped being reliable: accounts closed without appeal, reach adjusted without notice, archives made unsearchable.
A site with eleven pages on it and a domain you pay for annually is worse at distribution and better at persistence. For a growing number of people that is now the correct trade.