Substitute complicated with disputed and I agree lol. The Irish Government strongly dispute the term British Isles being applied against our wishes to this island, as it was invented to legitimise a land claim, not innocently by any neutral geographic body.
Unlike Scotland we've a treaty which now sets out our democratic pathway to getting the British government to finish their withdraw from our island, but we're no closer to holding the vote (and don't control the trigger).
Still raw Scotland missed their chance, but that too is a complicated topic!
Well the all island vote wasn't the source of change, a war unfortunately had to follow.
And point of clarification - Ireland didn't "leave the UK" - the British were forced to withdraw from 26 of the 32 counties of Ireland.
"NI" was carved out of the island by Britain holding on to as much industrialised land as they could, with as big a majority of British settlers vs native Irish.