Guys, China can meet its obligations of 200 billion dollars of additional purchases without really having to buy more. How ? Just place orders for it and it will take 2 to 3 years for these companies to deliver and after 2021 there is no more obligations on China's part.
Don't forget, this promised of purchase should be relatively easy to achieve. It uses 2017 as the starting point. So for starters, some of the the increase purchase would have taken place naturally hadn't Trump started this trade war.
In addition, some of the goods and services China promised to buy to increase the "quotas" could be at the expense of other countries. ie: Europe, OZ and South American nations (as China don't have "quotas" with these countries).
In exchange, a roll back of tariff in half! And, here's a joke, the labelling of currency manipulator! Lol ( I won't go in details why is such a joke). This label is not only symbolic, it allows PROUD wide ranging powers to use against nations being so labelled.
So basically all this phrase 1 deal did was put the clock back to last year. And this is more important, a truce for another year to enable Trump to get re-elected. (As his voters are no longer getting hurt by his trade war).
This, Trump believe will put him in a stronger position after he's re-elected. But, China isn't going to stand still, China had the past two years diversify and reduced it's reliance on US supplied chain and as a market. (Sure it's still an important market, but it's importance has reduced as shown by it's number two spot being replaced by ASEAN). It will also allow China extra year to get stronger and readied for any more threats from the US.
Finally, this phrase 1 agreement ends all arguments about "free trade" which US has always championed. In a free trade, surly it doesn't need governments telling another governments to buy more. If you have attractive products and good prices, people will automatically buy from you without government intervention! Which is the accusation thrown at China by USA.