The WTO has been effectively out of order these past years as the US has blocked the appointment of new judges to the appeals court.

It's supposed to have seven judges, a minimum of three judges are required to issue rulings, but since 2019 there are only two judges left [0]

So any ruling the WTO main body makes, like for example declaring US tariffs on China illegal [1], only needs to be appealed to be stuck in procedural limbo, which is exactly what ended up happening with the WTO ruling on US tariffs [2]

[0] https://www.dw.com/en/wto-judge-blockage-could-prove-the-beg...

[1] https://apnews.com/article/global-trade-china-archive-donald...

[2] https://www.bloomberg.com/news/articles/2020-10-26/u-s-appea...