These are the 'benevolent authoritarian-ship' outliers - very rare and depends on chance that the current person in power truly acts in the interest of the public - but when they are gone there's no legal framework in place that keeps their successors to do whatever they please.
EDIT: commenters are still all referring to Singapore which I remind you is the very rare outlier case.
Part of what makes Singapore interesting is that they have yet to have a leader truly invested in subsuming the power of the system. A big thing of Xi Jinping’s rise to power has been the systematic dismantling of post-Mao checks on power.
Singapore has yet to have a leader willing to take over the system, because two of its leaders were the dynasty that created the system. The real test is what happens when someone like that shows up; but even Western democracies face this problem, it’s just that the system has more built in speed bumps to overcome.
Rare outliers indicate the root problem is not the structure. All the interesting questions arise from the outliers
I guess it’s a good thing that the ruling party has been in power for about 6 decades at this point.