There's a difference between critique, and "holding accountable." One is a matter of judgment, and the latter is not possible without control. As for judgment, it's important to actually have an all-sided view, not just those of foreigners looking in. As for problems in China, the positive is that the CPC is working on the pressing problems in China as seen by the Chinese people.
As for China working on queer rights, here's a video from CGTN talking about the progress of queer rights, and here's one from Jin Xing on CGTN talking about the progression of trans rights. The state controls media like CGTN, the purpose here is to gradually improve public perception of LGBTQ rights and bring the people upward on it, as in China policy generally comes from below, not above.
As for fastest developing, in terms of economic growth, life expectancy, literacy rates, you name it. Compare the China of today with 10 years ago, 20, 50, and 100. It's an incredible feat.