One of my former bosses said “everyone is replaceable” whenever anyone left. Which is trueish I suppose. But when our director and sr analyst left within the same week and then I put in my two weeks they begged me to stay at least until the team was full again since at that point I was the sr most person on the team. I did not stay. Then later I learned the entirety of the rest of the team walked out in one day, as they had all coordinated new jobs together.