'Where you set foot' is actually the most important thing, or else we'd all be paying zero taxes in some state while 'not setting foot there'.
The most obvious artifact of 'where you set foot' is where you have your residence, and for taxation 'how long you're there per year' actually matters.
So if you spend > 1/2 of your waking life in Zone A, but sleep in Zone B ... well, it might make a little bit of sense to have some kind of tax regulation there, or not.
Because you get most services like water, roads, garbage, 'healthcare' where you 'reside' it's probably just easier to make it all about residence and that's that. But again, 'residence' is where you 'set foot the most'.