Unconvinced About ID Cards

ID Cards are back and i was initially against them when Tony Blair first mentioned introducing them in a fight against terrorism, this time they are being repackaged as a necessary part of the fight against illegal immigrants.
Despite being told by various members of Keir Starmer's Government how they will actually stop immigrants working, i still don't really understand how because if you are here illegally, you are hardly going to be filling out application forms for 'proper' jobs and will surly be heading towards cash in hand work where no details are required to earn your wage.
We already have information that proves who we are, every British National is issued with a National Insurance number when we hit 16 and if you come to the country, you are given a National Insurance number which begins with the letter 'S' so that's you pointed out that you are not British when it is asked for.
The issue is that a National Insurance number is only checked by employers to make sure you are who you say you are and i could easily give someone else's Number and their name, i would still get paid and why would I worry about National Insurance contributions, i'm not going to retire here anyway.   
That makes sense and currently if we have to prove who we are we need lots of forms of identification such as passport, driving license and utility bills so having one card which verifies all that is quite smart but i forsee many problems, hacking is one of them because if someone gets all that information in one go...basically your knackered.
My other concern is the good old slippery slope and what that could be used for by future more nefarious governments and suddenly we have a scheme with the most basic of information held to absolutely everything held such as medical records, affiliations, political memberships and all sorts of data that once all put together, could be a minefield.  
I therefore file the idea of ID cards under the file marked 'Unconvinced' but then it doesn't matter because as Blair found out, it has absolutely as much chance of getting through the Commons and the House of Lords as i have of ever saying anything nice about Nigel Farage's weird lopsided face.