Nonsense. The t.i. rate is helpful and the seller merely needs to set his cash register (which is, after all, just a computer) to accumulate the line item from the receipt that indicates the tax inclusive amount. He'll probably already be accumulating the price of the product not including the tax for other purposes. He's required by the bill to retain this information for a period of time.
Similarly for the other items on the receipt. As for the buyer, he merely needs to do the same thing - check the tax inclusive amount on his receipt. You'd help your understanding if you'd read the bill as it applies to the required receipt.
I'm not talking about the mechanics of collecting the tax, which are trivial. I thought that was clear. I'm talking about US citizens who are being urged to support the FairTax, who need to decide whether to do so or not. One of the important data will be, "What will this 'FairTax' thingie cost me? What will it do to the prices on my shelves?" This question can only be answered by looking at the exclusive rate. Given the inclusive rate, one must do extra algebra to find the answer. Why is the "extra algebra" version given? The reason is obvious.