You miss out the last part, the British governor would actually listen to the people.
HK had almost 95% of what defines as democracy, freedom of assembly and speech, inclusiveness and equality, membership, consent, right to life and minority rights. It is only missing some part of voting.
> In 1946, shortly after the war, critical voices were raised against colonialism. Governor Sir Mark Young proposed a 48-member Municipal Council with significant competence to govern, one-third elected by non-Chinese, one third by Chinese institutions and one-third by Chinese individuals, known as the "Young Plan", believing that, "to counter the Chinese government's determination to recover Hong Kong, it was necessary to give local inhabitants a greater stake in the territory by widening the political franchise to include them."[9] The reform failed because of much resistance from expatriate companies, a new conservative and mistrustful governor, and London's fears of Hong Kong becoming a political battleground between the Kuomintang and the Communist Party of China (CPC).
China wanted HK to be special and successful, to use it as a showcase for the 'one country two systems' model. Now China just want to not lose HK. Huge change in thinking.