I think that VEX in China is unique with how the overall competition is structured such that ways for qualification are spread across various tracks/tournaments with different qualifying processes, unlike most regions where there is a single ERC (States or Nationals) that would determine overall region qualification. In China VRC tournaments generally include a lot of provincial and local tournaments to qualify that are open to all teams (the Asia Open, Asia-Pacific Robotics Championship and the World Robot Contest for VRC) but there are also invitational tournaments that are more restrictive (such as the STEMSTAR, VEX Academy, SJTU or the international school tournaments), some of which also qualifying teams to VEX Worlds.
I’m quite sure that there has to be some sort of logical reason behind the RECF’s approach in allocating some of the spots (which, admittedly, isn’t the most transparent). I’ve spoken to one of the RSMs for China before regarding the rationale for the WYIS VIQRC Tournament in Wuhan and the TIS VRC Tournament in Tianjin, both open only to teams affiliated with international schools in China and not open to other teams, and she explained that this tournament was created (and each allocated one Worlds qualification spot) to accommodate for the many international school teams that are unable to build and compete with how early the Chinese VEX season is, but still give competing teams a chance to reach VEX Worlds. As much as this can be unfair to other teams in China, there is clear reasoning behind the allocation of one VRC and one VIQRC spot to these two tournaments and I can personally attest to the quality and competitiveness of those that actually do qualify to Worlds from these tournaments (for the VRC team from the Shanghai American School that qualified, 1294X, they got top 40 globally for skills).
I think that the distribution of spots for China isn’t necessarily unfair, but rather just that it lacks transparency on why spots were allocated in such a way (especially with the complex tournament structure in China), something of which I hope that the RECF (or whoever manages VRC and VIQRC in China) take into account more in the future.