So this is basically the ID card that every other EU/EEA member state already has, except for the UK.
The only difference is that Ireland wants to call it the passport card, which is exactly what it should be.
The UK already introduced this sort of card but then scrapped it. The problem was not the card, but the complex and invasive ID database of UK citizens that the Labour party wanted to build. Currently, one obtains a British passport by demonstrating that one is a British citizen, but there is no definitive database of everyone who is or could be a British citizen - only a database of British passports issued since the start of electronic record keeping.