So the bill I linked to includes a link to a PDF of the original bill which passed, if on the other hand there were changes you would see a pdf for each version

So the bill I linked to includes a link to a PDF of the original bill which passed, if on the other hand there were changes you would see a pdf for each version of the bill. Florida has a search function for their statutes that allows you to then select the year/version of the law. If the Law was amended in a given year in the annotations there are “redline versions” of the law pre amendment, with changes and final. So again similar to what you describe but as you say...limitations to existing systems. Obviously standardization is also another problem, it would be hard enough to work with federal code and 50 states but the reality is each county and city/municipality can have their own bodies of laws, rules, regulations and ordinances...so thousands of bodies of law, in the US alone.