> Not once have I heard anyone even broach this as a topic.

I have a feeling you just don't pay attention or, from previous experience with you, are incapable of determining how other people feel about this topic.

> ROI is a perfectly serviceable term for helping people understand what you mean, if the context isn't clear enough already.

It's a specifically politically charged term used by people who either don't know better or have a bone to pick. It's not commonly used in Ireland and it's not used to differentiate innocently between Northern Ireland and Ireland.