Alas, you've not discovered a hidden pattern, except maybe a hidden pattern in the kinds of people you socialize with. Chinese nationals cannot hold dual citizenship, and renouncing their Chinese citizenship creates very serious complications, including around property and inheritance when parents die, which you would be aware of if you knew any Chinese person well enough to have had this conversation with them.
Based on gov.uk immigration system statistics data and tables, among those with indefinite leave to remain, the most likely to seek citizenship are British Overseas Citizens, Austrians and Lithuanians. The least likely are Moroccans and Venezuelans.