allow for the trends of Late Ming to fully flower instead of being stopped by the Qing.
In almost every conceivable way the Qing were a great improvement on the late Ming, especially in the domains of warfare, administration, agriculture, and economy. The Manchus essentially reinvigorated what had been a declining system of administration and allowed the creation of China's greatest empire since the eighth century AD.
Why should the Qing care that Europeans are good at sea?
From the Kangxi emperor:
The Russians, Dutch, and Portuguese, like the other Europeans, are able to accomplish whatever they undertake, no matter how difficult. They are intrepid, clever, and know how to turn a profit. As long as I reign there is nothing to worry about from them for China... But if our government were to become weak, if we were to weaken our vigilance over the Chinese in the southern provinces and over the large number of boats that leave every year for Luzon, Batavia, Japan, and other countries, or if divisions were to erupt among us Manchus and the various princes of my family, if our enemies the Eleuths [Zunghars] were to succeed in allying with the Tatars of Kokonor, as well as our Kalmuk and Mongol tributaries, what would become of our empire? With the Russians to the north, the Portuguese from Luzon to the east, the Dutch to the south, [they] would do with China whatever they liked.