Other countries have no issue with this, because they understand the advantages.....
Whilst other countries appear to have no problem with I.D. cards there is, within the British psyche, an inherent objection to such things. Do we really need to be hearing "Papers please"?; the refrain usually heard in states more authoritarian than the U.K.. After all, apart from the need for I.D. cards during wartime, we have no history of the requirement for such documents.
It was a battle to get rid of them after the last war and the need to have them was not repealed until several years after the war ended. A typical example of state reluctance to relinquish control.
In a former existence I had to carry a form of I.D. card but now I no longer need it, I have no wish to have another just to prove who I am.
Furthermore, the problem is these things are never simple. Remember, they will be bureaucratic and that just breeds more bureaucracy.
No thank you to "vaccine passports" or I.D. cards.