But the point is everyone is expendable. I worked for a company around 2009. They laid a lot of people off that had more seniority than I did. I wondered why they kept me around.
Three months later I found out. The founder had written a bespoke development tool chain in C++ using MVC and assembly. The board push him out and the CTO told me that I was now responsible for maintaining the tool chain because I was the only one who knew C++ and assembly.
In the extremum, everyone is expendable, but not everyone is equally expendable, as your own anecdote bears out.
When you expend enough people, especially increasingly less expendable people who carry your basic institutional knowledge and skills, you do so by inflicting damage on your company or organization.
The economic winds may dictate that, as they did frequently in the 2008 economic crisis, but it's not like there is no institutional cost to expending people. This is the basically why countries like Germany and the UK are paying employers to keep idled people on payroll.
You don't have a group life insurance policy through your company? Sudden unexpected death is exactly what that supposed to cover. If not, that's unfortunate, especially since it's fairly common among white collar jobs at least.
If you do, it should cover at least your funeral costs, which should be pretty minimal if your cause of death is meteor strike. It would likely cover a percentage of the income you would have earned for your remaining years of work.
But opening a req seems totally reasonable when you are demonstrably not coming back.