Cost optimization
Not all that long ago buyers of electronic components insisted on a 2nd source for the parts to be available and although had enough stock on hands to keep going for a while when a shipment did not arrive.
Since then the powers that be seem to have decided cost optimzation is way more important than resilience as things like factories taken out by fire/earthquakes/tsunami or supply chains being disrupted by things like covid-lockdowns/wars/brexit are not happening frequently enough to figure in.
It would be interesting to see their evaulation of these risks before taking the cost optmiaztion so far that the supply chains barely worked in normal times and compare them to the actual figures nowaday.