This viewpoint seems a bit defeatist. It's true that even buying local rarely avoids 100% of interaction with overseas companies, but there's a lot of room between 100% and 0%. If you just don't want to think about it, that's one thing, but if you do care, I don't think letting perfect be the enemy of good is productive.
I am not defeatist. I am realist / pragmatic and I am looking after myself an my family. It is not in my job description to wage political crusade about China. I buy whatever makes financial sense for me. I am way more concerned about the way FAANG and the likes manage to affect my life.
The only reason we have non-local is because of the international trade and your own big corporations moving production and sometimes even research facilities overseas. If you not happy about the non-local situation go to fat cats who sold your country for an extra buck in profits and bought politicians to let them do it and convince them that they're wrong.
