I was born in China and my family runs factories here for many years.
What you mentioned is true, the absolute majority of the supply chain of the big name companies are still in China, and many of the alternatives in Vietnam are somehow managed by PRC background capital.
However, it’s absolutely a good start. The eco mic crisis raising in China will be like the 1930s in US, if not worse. My family are actively searching for ways to selling out everything and move out the country but it’s clearly prohibited by the Gov. We are worrying it will eventually becomes a new Third Reich in near future, when the supply chain will be completely destroyed.