I assumed you would say China's suppression and censorship is okay because it's anti-capitalist and I mentioned why that wasn't an adequate explanation. One could criticize the state without being a capitalist. It is not reactionary for one to criticize the state, unless you are asking for unconditional acceptance of the state. If criticizing the state is considered to be going against the will of the majority, then majority be damned.
I also assumed you would say the west does the same thing, and I mentioned why that wasn't really true either. Despite their suppression you can still easily find and access criticisms of the state within their countries whereas this is not the case in China.
In my view it is impossible to have a balanced view of a state if all dissent and criticism is cracked down. Labelling all dissent and criticism as capitalist is a wholly inadequate and frankly infantile response.
On western countries not improving: I would say you're also not considering their existing state of development; it may be easier to develop undeveloped/less developed regions than it is to develop already developed regions further, I would expect plateaus to be a thing in any country's timeline of development to occur. Some decades from now when China reaches the same level of development one could see plateaus there too.