> The majority of large companies in China will in fact be forced to participate in a joint venture.
That's just not true any more. Companies sometimes choose to enter joint ventures, but in most industries, they're not forced to. Many large foreign companies operate without JV partners in China.
> There can be no rule of law without an independent judiciary, and the WTO mechanism's you speak of are completely unenforceable.
WTO rulings have led to concrete changes in Chinese policy, and beyond that, China has undergone very fundamental changes to its economic structure and regulation as a condition of WTO membership. In terms of things like IP enforcement, there is something approaching rule of law in China. Western companies can enforce their IP rights through the Chinese judiciary, and they have a very good success rate.
> They were technically "broken" up. But they still have have CCP liaison committees
Having a "liaison committee" is very different from being a giant monopoly that rules the market and doesn't have to fear competition. Many large state-owned enterprises were broken up, forced to operate on a profit-basis for the first time, and forced to compete with one another and private enterprises. Private enterprises now make up a large share of the Chinese economy.
> It did improve for a few years, but the current administration has managed to reverse nearly all those improvements.
Do you mean Xi Jinping? Restrictions on foreign companies have continued to be loosened (e.g., the recent loosening of JV restrictions in the auto industry, which made Tesla's Shanghai factory possible).