Perhaps they would be more useful for accessing benefits and services instead of employment.
But that's exactly the risk , and Darren Jones slipped up and revealed the intention when he said that it could be "the bedrock of the modern state and will allow for really quite exciting public service reform in the future"
Public services such as the NHS, emergency services etc are currently equally available to all and free at the point of use. So what needs to be reformed?
In the blink of an eye they'll have it tied to your tax record. And that's when it gets scary... How long will it be before they start restricting access to the NHS: maybe charging a contribution from those with 'broad shoulders' because we need to 'save our NHS', or prioritising 'the most vulnerable' (ie people who don't pay in 
)?
Then you can move to the dystopian level... (You do have to consider how it could be used: we've seen how well-meaning laws have been twisted and used against us in recent years - despite assurances that it would never happen)
They could very easily and quickly link it to separately implemented electronic surveillance on online activity. The EU are looking at that, and it also appeals very much to Labour's controlling instinct. And then what? Starmer's recently rhetoric about a "contribution society" (which we all know has nothing to do with financial contribution, which Labour despise us for). Does Right Think improve your access to public services? It's a pretty short step! I'm not really a conspiracy theorist, but I can see so easily how it would play out... each step presented as reasonable until we've reached what is currently unthinkable.
I have quite a lot of faith in the UK as a stable, long-established democracy. We have one of the oldest legislatures in the world, we wrote the Magna Carta, we were instrumental in abolishing the slave trade (slavery being oulawed in england since 1100), we led the creation of the ECHR based on our own laws and values. Our combination of history and values are really very impressive and strongly protective.
But... but... but... we've seen in recent years that whilst these strengths do protect us eventually, they're slow to mobilise. The Trans-lobby caused havoc for 10 years before women's rights to protection were successfully asserted (and I don't think it's over). Immigration went up sharply from 2004, and it's taken 20 years and counting for any party to acknowledged that it's not what people want and act on that (they're still trying to keep it going - just trying to hide it from us. I include Boris in that condemnation for his actions after Brexit, as well as Starmer now).
Fast, big change is the danger. Labour want to get this through before they're kicked out. I think we need to mobilise just as quickly to prevent it.