Even assuming that all hardware is backdoored, it can still make sense to use hardware from your own country, since your own government probably doesn’t want to harm its own economic interests.
I’m more worried about the other state understanding the topology of my state in higher resolution than my own state does. The ramifications are endless, and I believe that to be the more grave threat (aka undermine society at its cultural fabric while stealing/undermining the economy and crippling the military).
As with everything else, think through the threat model.