Earlier quoted context omitted.
China has had 4 or 5 revolutions (depending on whether you want to count the Cultural Revolution; it was perhaps an anti-revolution where while revolutions normally attempt to overthrow the government, the cultural revolution attempted to maintain the government's power) in the last century. There are few countries in the world that can say they've gone through five revolutions within the last century. https://en.wik…
I don't think this is the best way of looking at things. China is virtually a continent unto itself. It's a huge and fractous territory. It is little surprise that when the empire fell at the beginning of the 20th century after 4000 years, in the most tumultuous period of world history, that it went through a long phase of war and revolution. It was divided among the West's great powers, repeatedly invaded by a risin…
At the start of the 20th century the UK controlled so much of the world they said the sun never sets on the British Empire. It led the industrialisation of the planet, lost millions of men to the trenches of the first world war, then was nearly wiped out and turned into a slave state by Hitler before successfully liberating Europe with its allies. It went through enormous social turmoil in the middle of the 20th century: socialist governments and ultra-militant unions repeatedly damaged its economy so badly that by the end of the 1970s it was significantly worse off economically than Germany - a country it had flattened in world war just 40 years earlier, and which had then been split in half by the Soviets. Professional and well armed terrorists repeatedly attacked the government, in one case almost managing to assassinate the Prime Minister [1].
That all sounds like a much more traumatic modern history than China's. Despite that there has never been a revolution in the UK. The closest you can find is probably the English Civil War in the mid 1600s, which ended with the king being invited back to become King again after the revolutionaries turned out to suck more than he did.
So I don't think we can just write off China's history or concerns of its leadership by saying it's merely large, and not naturally unstable or violent. For whatever reason China does seem to have gone through far more revolutions than other countries have done despite the apparent lack of external events that could have triggered such instability.