Earlier quoted context omitted.
I think legitster is suggesting that the sticker price on the product should be the price paid, rather than a uniform sales tax code. If the seller knows what to charge the buyer, then they know what they need to put on the sticker.
Local retailers would oppose this in very strong terms as a thumb on the scale in favor of online retailers. Online retailers would presumably still be able to show pricing before knowing a shipping address, so their pricing would be pre-tax. That would make the apparent price differential even greater, and on every item. I think this would make the marketplace less clear for consumers.
Maybe you're just less intelligent than the average consumer and need some more protection? Or is it something else?