How would they “just do it”?

Federal taxes do not go thru states. They go from taxpayer to federal government at tax time, and from payroll processor to federal government for withholdings.

You want states out there hacking transactions?

Most payroll providers aren’t based in the same state, and most corporations don’t only operate in one state. Hell, most are headquartered in Delaware.

For the vast amount of Americans that money doesn’t touch any states besides Delaware.

Like, there’s a lot of reasons why what you’re suggesting just can’t happen.