Losing an election in the US just means you are out of a job - and lose all its perks.
Losing power in an authoritarian government could mean you are arrested for “corruption” and sentenced to death.
The paranoia (and occasional country sabotaging acts) of CCP critters are justified as it’s a no holds barred fight for power and survival.
But if you give them enough rope and fall out of favor, ya, you will be made an example of. It is difficult to make it very high without creating lots of rope, however.
The US is nearly there.
If you are arguing that the Communist Party of China is not subject to internal politics, I don’t think that argument will withstand much scrutiny. Think about how much internal politics there are within the Democratic party or the Republican party of the US. Having a one-party state does not inoculate a country from internal politics.
There are pros and cons to each approach. The US system is certainly slower and more infuriating but is also less prone to shooting itself in the foot. China's system works well when it works, but it more easily produces giant missteps like the Great Leap Forward or zero covid.
Who's going to vote their government out or jam things up with filibuster? For better or worse their government just 'does'. You cannot seriously compare a system like this to US/UK democracy paralyzation during things like COVID.
I do not think their system is better or worse, it's just not subject to any kind of politics internally that would get in the way of whatever the hell their national intentions of the now are.