it had a stellar bureaucratic technocracy with leaders revolving every 5 to 10 years and it was not ticking off the USA nor its neighbors. And Taiwan was getting more and more integrated economically and culturally with the mainland
Then came Xi and his 7 dashed line and his hardball with the "loans" given to China's potential vassal states and then his hardening stance against Taiwan squandered all of that away.
Hubris
And Hong Kong.