It feels onerous as an idea because bank statements, monthly bills, payslips, will bequests, stock vests and trades, bank robberies*, and investment income each have different ways of being tracked. At least most of these records of individual financial activity come with a PDF these days. It wasn’t that long ago that applying for a loan meant scanning in papers for your lender to review.
Computers are smarter now. Not only can they read documents (or at least match the shapes against shapes they’ve been told are real) but they can also understand the contents too (or at least match the words against ideas they’ve been told are real.)
There may well yet be a future Data Valhalla where individuals hold their life.zip themselves, and upload whatever bits of it are needed to get that Nordstrom store card / car financing / cheeseburger loan without having an intermediate credit agency.
*I feel there’s a kernel of a joke there about a bank robber asking for a receipt with the loot in anticipation of declaring it on their tax return.