How hard would it be to fly an engineer to Shenzen and physically test the supply? I get it. Chinese vendors are not as reliable as Western suppliers. But it's

How hard would it be to fly an engineer to Shenzen and physically test the supply? I get it. Chinese vendors are not as reliable as Western suppliers. But it's not like ICs are black magic, it certainly wouldn't be that to enforce third-party quality control on them. Sure every now and then you'll pay for a batch you gotta throw out. But that sure as hell beats business killing 52-week lead times.