I haven't worked in an office in years, but in my case it's travel. The company has travel policies that are what they are. If I'm going to spend my own money and points to upgrade to travel that is outside of policy, well I'll do that. I might object if company policy were to travel baggage-class but it's really not. So I'll pay out-of-pocket here and there.

For a while it was company policy that all international flights had to be business class.

It all got restricted due to covid, and I doubt they’re going back :/