The accounts generally aren't linked together. Everything about the UK government IT is a huge group of independent systems all pretty much isolated from each other. You can argue over whether that's down to incompetence, organisational turf wars, or good security design.

Which is why you have completely separate account to pay the same government for crossing one specific brige in East London than you do for vehicle tax.

Most government websites do use the same frontend toolkit (a rare win for UK governmental IT) but front completely separate systems.

I mean they could be more tightly integrated but any agency could match one account with another any time they felt like it

Breach = data for all citizens.

Card = one person, limited use.

But most importantly: a Hitler rises to power = opposition is screwed.

Ah, good old Godwin's law...

If a Hitler rises to power you will be screwed with or without an ID card, so please don't use such a silly argument.

Doesnt have to be a Hitler, imagining the worst case scenario for laws is absolutely apt.

Consider the Australian Access and Assistance bill. Among other things, it permits ministers to issue TCN's verbally. As far as we know (theres no oversight) this hasnt been done. But its concerning that the government can verbally require a corporation to (open endedly) change app functionality.

It would be better if Jim Hitler, had to fight the existing democracy to erode our freedoms, rather than just having to ask a minister to make it so.

Its absolutely better to assume the worst case than the best.