JIT may be good in many industries but electronic manufacturing, nah, unless you are a very big player and have very good direct contracts with the manufacturers so they guarantee you certain delivery dates.
For small to medium sized players, even during good times, you have to plan ahead and buy parts to last for the manufacturer standard lead time which is very typically half a year; for some parts, it's a whole year and for some, just a quarter.
If you assume you can get parts quicker than manufacturer standard lead time, you are pushing your luck, you don't need a big crisis to have to wait for months. Yes, JIT often works out if we ignore component crises every 3 years, but it's a risk even during good times and the management needs to understand it being a risk.
Still remember ceramic cap crisis 3 years ago? It pretty much self-corrected in just 3-4 months, and was manageable with some redneck creativity ("oh, just replace 100nF 0603 with 56nF 0402, it will fit and work"). Now is worse.