This in no way jibes with my experience as an employee. I know the value I provide, how long it would take to replace me and how much the company has invested i

This in no way jibes with my experience as an employee. I know the value I provide, how long it would take to replace me and how much the company has invested in me and there is zero chance that I get fired tomorrow. Theoretically my boss could wake up and fire me, but practically there are many reasons whey they "can't". Similarly, it is very rare to see someone get fired in the first 3-6 months on the job unless they are ridiculously unprofessional or unqualified. There are high-profile companies where it could happen, but they are noteworthy because it is so out-of-the-ordinary.