The scale of China...
I've 'watched' China for several years. The scale and the speed at which China things is what alarms the collective West (meaning the western countries with the USA as self-appointed leader and decision maker) the most. Look on YouTube for Chinese docks - they are incredible.
China has not yet completed its version of the Industrial Revolution. It is still in the early stages of it, perhaps about 25% of the way through. We really have not seen much yet. Prepare to be amazed.