the government should be barred from implementing a law or regulation that requires "reference implementation " to prove it is "possible to implement"

If it needs such a thing it is too complex and should be repealed

Over in The Netherlands we're seeing the opposite happen. Seemingly trivial laws are getting rejected because the responsible Ministry considers it "too difficult". In reality it's most likely just politically inconvenient.

For example, it was deemed "impossible" to adjust student loan interest rates, because the software would take two years to modify. Either they are completely incompetent, or they are deliberately lying for political reasons.

So yeah, refusing a law because it is "too complex" won't work either.

Lots of our dutch bureaucracies have comprehensively failed and are barely treading water. There is no capacity to do the current job, let alone any new changes.

The only way out is by accepting that the current state is unacceptable, and working on a long and slow fix, during which we don't say "this is unacceptable therefore we require immediate changes". This will fuck people over. But not making those changes properly will fuck people over even more.

We might be on an administrative brink. That takes a radical approach to fix.

OK, well, in spirit I can see how that sentiment arises. For practical purposes, though, no matter how simple a calculation, if a government requires that I do it, I want to see precisely what it's demanding. It is unreasonable to be put in the position of guessing.

You are speaking about different objectives. Quite apart from the basic "(how) does it work logically" which published formulas address, simplicity can be an objective in itself.

For example, Germany has one of the most complex income tax codes in the world, with an average compliance burden of 136 hours[1]. That's a hit to national competitiveness and GDP, and worth addressing in its own right.

[1] https://taxfoundation.org/blog/germany-tax-g7/