Thank you for your question, Mr. Laforest.
There will always be some difficulty, and we've seen as evidence in the American example that they were crushed with 700,000 transactions that all had to be verified and confirmed, and also that the government was forced to issue cheques and funds directly to the car companies, which meant 20,000 registrations and 700,000 disbursements.
By using the GST specifically, you simplify it to a line transaction on the contract, where there's no GST appearing on the bill to the customer.