Software engineers and entrepreneurs are extremely clever, numerous solutions will arise to integrate with all of the major ecommerce platforms to automate this. This won't be much of a burden on business. As long as regulations are clearly defined (unlike GDPR) the industry will deal. Uncertainty is always the biggest risk.
You have no idea what you are talking about. Won’t be much burden on business? If you have physical shipping addresses, it is a bit easier, but what if you sell virtual goods/services? Billing address? But that doesn’t actually have anything to do where the person is actually buying the product. If I go to a masseuse in California but my credit card has a Texas billing address, I am still charged California taxes. So…
Orrrrr a couple of companies will step into this problem space, solve it, and everyone will offload their tax compliance to those companies, in exactly the same way that we don't all waste 1,000,000 engineering hours on the arcana of banking and credit card networks and just offload that concern to payment gateways with nice APIs.
This is already the way it works in most of the world. HN is showing its provincialism by convincing themselves this is some kind of impossible-to-solve problem.