[Fifi]

I think this question best illustrated the difference between an IRP and an RPI. Not why an RPI is better (though subjectively, I'd maintain they are better) but why they are different.

When writing a novel or story an author will often write an elaborate back story. They have no interest in including said story in the published text, but the richness of the backstory will be be felt in the subtext and the way the story hangs together. Almost a ghost facet of the text.

The think command does the same thing. Only the player thinking sees their thoughts, but it makes their rp deeper and richer and more fleshed out. Other players won't see the thoughts but they will see the depth that stems from those thoughts.

In an RPI that's more than important it's crucial. In an IRP, I have to assume, from your question, it has less or no value.

So, this is why RPIs are different, and why they continue to use a command that you perceive as outdated.