I don't know why you would ever want a lower growth rate. China's estimated GDP per capita in 2021 is $18,900 (PPP)/ $11,800 (nominal) whereas the US is $68,300. For comparison, during the late 1980s and early 1990s Japan's GDP per capita (nominal) was actually higher than the US. China still has a long way to go to match Japan. It should not rest on its laurels.
I think China should and can grow faster than 5% in the medium term (before 2035, say). That said, the US per capita GDP is greatly inflated by the dollar's reserve currency status and the US hegemony in general. They will be threatened by China's continual rise and the growing Chinese power in all dimensions. That's why the US ruling elites are scared and are hell-bent on preventing China's rise.