And that documentation takes time as a manager, which costs money.
But I admit not knowing completely because I haven't had to fire anyone yet. I have talked to legal about the process regarding someone not on my team.
Companies develop documentation processes as they get bigger for myriad reasons, but there is very little to worry about in the US in the way of terminating someone.
The only adverse effect most times is increase in unemployment insurance premiums, if you do not have enough documentation to show you terminated for cause.
Otherwise, 99.9% of the time, the terminated person can claim whatever kind of wrongful termination they want, they probably won’t get anywhere via the courts.
Not in the US. All you must do is tell them they're gone, walk them out the door and that's that. You must pay them any worked days not yet paid but that's all.
Company HR departments sometimes establish more elaborate procedures for firing, but none of that is required by law, it's just internal company process.