Question for you.
How many of Needham's work, Science and Civilization in China, have you actually read?
Myself, I read maybe 100 pages. There was just too much. Back then there was like already 10 volumes.
Then he kind of added another 10 volumes, for over 20 volumes, of work (something like, I don't even how many volumes there are), all from ancient Chinese texts, all in the view of the lens of a Western trained scientists a prominent one, all he did was dig all the ancient to find all or any scientific thought of China and accomplishments of over 2000-3000 thousand years.
People may not always agree with some of his conclusion in parts of those volumes, but people from what I remember they were in awe that he was able to read everything, literary everything, write something like that.
What we are talking about here, really is a work that is like one of the Imperial Chinese Dynasty historical records. Inside a Chinese library, if we saw how volumes there are in the dynastic histories, that is what Joseph Needham was able to do.
Unless you are a prominent Western trained scientist, or have read this work of Needham's, or dug through ancient Chinese texts looking for engineering and science, then I cannot see how you can make those comments.