i agree with Gambit, the plaza accord was kind of necessary, and it avoided a trade war/protectionism. You people should know that Japan is even now still a quite close economy/society compare to the west/U.S Japan still doesnt wants to agree for more free trade, and its imposes huge trade tariffs on imports of most U.S goods like automobiles/electronics etc. In fact even recently, United States farming groups are urging that, if Japan continues to insist that it should keep import duties on its ultra-sensitive agricultural products – rice, wheat, beef and pork, dairy products, and sugar and starch – it should be excluded from Trans-Pacific Partnership (TPP) negotiation, and japanese farmers/politicians have been insisting they wont buge on this issue and many others. What do you want the U.S to do, when it provides an equal footing for japanese goods in the U.S but Japan doesnt want to provide the same to the U.S. If anything i think the U.S hass been/is too lenient on Japan(mainly because the U.S still sees it as its main ally/unsinkable aircraft carrier in Asia.).
The Japanese Government has been protecting Japan's automakers through preferential allocation of foreign currency, providing technical assistance for auto parts makers, restricting foreign investment, restricting vehicle imports, putting protective tariffs on imports, leveling high commodity taxes on large cars, establishing complex type-approval procedures, and by banning use of imported vehicles by government office. The cumulative effect of these restrictions resulted in a drop in foreign share of Japan's market, from 60% in 1953 to around 1% in 1960 and today it still stands at just about 6%.
If China took al these measures like Japan did/does, then believe me i think even the automobile industry in China will look very different today(being dominiated by European/U.S/Japanese companies). I have been both to china and Japan, and studied quite alot about both countries, and i can attest that surprisgly for me, Japan is even far more closed than China
But Japan shouldnt take the U.S good will towards it as meaning it can do whatever it wants while restricting U.S goods on its soil.