As Churchill once said very wisely about war and optimism over certain tactics. "all things are always in motion simultaneously". In other words, we can't really know at all whether China's naval techniques, technologies or tactics will work well against U.S. naval power, or whether the opposite will happen, until the two actually fight for real on a major scale.

With that said, nothing prevents the U.S from imitating any tactics (including swarming by tiny boats and ships) that the Chinese use effectively against the U.S and its allies in a real naval war.

To name a very current example of my first point above in action 24/7, just look at the Ukraine/Russia war today. It has evolved in ways that very few people could have predicted just before or right after it started, with surprises on both sides.

To highlight how the same worked at the beginning of the second world war, partially prompting Churchill's own later phrase: the air defenses of the UK were thought adequate against enemies in 1939, until they were proven to not at all be so, and only improved through very deadly trial and error by 1943. France in 1940 was thought by nearly all powers to be more than a match against a German invasion (and indeed materially it was, on paper and stationary on the ground), until it was proven to not at all work as expected in just 6 weeks. All things always shift simultaneously in ways that can confound any expectation, particularly in situations as ferociously dynamic as large wars.