"why you should be using Free Software for everything that's really important"
I'm sorry, but having regularly been in a situation where I'm trying to get sign-off on large tech project the first question is "what is the support package like" and the question never asked because caring about that kind of thing is below their pay grade is "but is this software free and open?"
That's because organizations like the one you work have governance models that aren't actually focused on delivering IT services.
If you use open-source software, you don't need to procure anything, right? At one level, that's great, but to people who run the contracts unit or procurement team, that doesn't compute. In their world, you hassle people for a discount and fight over contract terms.
Why do you think that Red Hat sells support contracts in the guise of a software license?
Answer: Because the processes that enable big companies/government to spend money on services are vastly different than software. On a services contract, you need to negotiate statements of work, etc. For a software contract, you just need to buy a software SKU and a maintenance/support SKU.
I'm sorry, but having regularly been in a situation where I'm trying to get sign-off on large tech project the first question is "what is the support package like" and the question never asked because caring about that kind of thing is below their pay grade is "but is this software free and open?"