The US really needs to setup nationwide tax infrastructure such that commerce is not stymied by the compliance burdens, or legal risks of making a mistake.
As a seller, there should be a government website with an API that I can hook into where it calculates all applicable taxes and does all that nonsense and all I need to worry about is providing the product or service.
Presumably even if such a system existed (there are private systems like Sabrix that do the hard parts of this), you’d need to give the system information that you might not currently have for a web visitor (like the physical address of the visitor).
Sure, but the government can make it so the seller does not see that information. Or the government can make it so taxes are not based on your address.
I'm not sure I see a practical path to the latter, at least at the granularity of "what state are you in?" and in the context of "at least one state wants to tax such transactions".