Great article, thanks.
Raw materials are the first step in the total supply chain. Any shortages or limitations here affect everything downstream, including and not limited to the component parts but also their manufacturing tools and processes (think moulds, machinery, chip manufacturing etc).
In the current manufacturing "Just in Time" environment, delays at raw material level have significant impacts. Manufacturers do not want to have millions of dollars in warehoused components as these are additional costs. And launching a new product with uncertain supply would be potentially damaging to the brand.
While the "supply shortages" may not be only magnesium or its alloys (as this article highlights), there are still many global shortages that will have an impact to some degree - and at different frequency or intervals - and that makes forecasting and production schedules that much harder to predict.