Surely anyone doing analogue design for serial or mass production would do a sensitivity analysis, even in 1984. Now it should be much easier to repeatedly ran

Surely anyone doing analogue design for serial or mass production would do a sensitivity analysis, even in 1984. Now it should be much easier to repeatedly randomise the values of every part within their tolerance and run a simulation to check that the end product remains in spec. You might even do this in order to find out if wider tolerance parts would be good enough and save a little money.