The more we integrate with China, the more they will leech off our progress. There's no objective stance on whether or not this is bad or good, but globalization will basically allow China to leech our progress artificially and reduce our own standards slightly.
Some negatives for China are that we create an artificial large wealthy market that creates tons of jobs for China, while China isn't actually developing a proper consumer market for their own goods. This could create dependence but it might also mean it messes with the natural development of a developing nation.
A lot of the same reasons The Federation in Star Trek has a no-interaction with less developed races.
The "prime directive" is completely nonsensical. (And in fact it doesn't seem to stop Star Fleet from messing with more primitive species, it simply causes them problems when they want to do something completely reasonable, like save them from an asteroid collision.)
Personally, I enjoy leeching off the progress of others. I'd hate to have to invent philosophy, physics, math, biology, etc. from scratch.
And of course, a huge amount of the technical platform we enjoy originated in China, including the gunpowder we used to steal our real estate from the Native Americans with.
We (Americans) are "leeching" off everyone else, and they're leeching off us. Who invented gunpowder, the crossbow, stirrups, the printing press, noodles? The Chinese. Who invented radio, quantum mechanics, the computer, programming languages, symbolic logic? Hint: not Americans.
This leeching is pretty much how humans make progress.
Some negatives for China are that we create an artificial large wealthy market that creates tons of jobs for China, while China isn't actually developing a proper consumer market for their own goods. This could create dependence but it might also mean it messes with the natural development of a developing nation.
A lot of the same reasons The Federation in Star Trek has a no-interaction with less developed races.