You can't seriously believe laymen will try to implement their own tax calculators.
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.
Yeah, yeah, we've heard "our models will be doing everything" for close to three years now.
> a harness for getting this done probably exists today, gastown perhaps
That got a chuckle and a facepalm out of me. I would at least consider you half-serious if you said "openclaw", at least those people pretend to be attempting to automate their lives through LLMs (with zero tangible results, and with zero results available to non-tech people).