> well it actually implemented a normalization pipeline and a tax computing engine which then did the taxes, but close enough

You can't seriously believe laymen will try to implement their own tax calculators.

of course not.

what I believe is that laymen will put all their tax docs into codex and tell it to 'do their taxes' and the tool will decide to implement the calculator, do the taxes and present only the final numbers. the layman won't even know there was a calculator implemented.