That tone tells me that the conversation is now in lawyer-mode. If I'm using it, it's because I'm no longer willing or able to communicate normally. If I cared about you, you'd see me angry. If I don't care about you, you'll see me having this style of conversation, which IMO is far more aggressive and dangerous than actual anger.

If I'm on the receiving side of that kind of tone, it's time to either re-engage with normal conversation and try to salvage the relationship, or now I'm also mirroring that tone and we can never have an honest conversation again.

I've yet to experience that. Been doing NVC for more than a decade. It helps a lot defusing tense situations. This example isn't very good. It shows the form but not the power.

Perhaps one can see them as simplified examples of the type of message you're aiming for, and it's left as an exercise to the reader to phrase it naturally.

Maybe the first few times.