yes, we know, there are historical territorial disputes all over the world. But can somebody here make a case that this is not actually/solely to appease China (over Taiwan presumably)?
If the essence of your question is "are there US-aligned/non-China countries who would have issues about certain flags", the answer is yes. Good example: the flag for the Democratic People's Republic of Korea, aka North Korea. The Western world acknowledges North Korea as a separate entity. South Korea does not and considers the North part of its territory. They wouldn't be too happy about a NK flag on their operatin…
Microsoft would not respond to North Korea by deleting all the unicode flags all over the world, so while that might get you closer to the essence of your question, there's no point in me asking my question if you are just going to dodge it.