No I get that but you could eg link your passport to the One Login and it'd make the UX much better for many services. For example, if you linked passport, driving license and NI/tax account, then I think for 99% of services you wouldn't need to fill anything in.

FWIW I was impressed with the DVLA driving license process, where you can type your passport number in and it pulls your photo from the passport. Very smooth. Could be even smoother if it could link automatically your passport.

steal wallet, receive identity