If it takes a thousand accountants, someone has done something horribly wrong.
The store down the street from me doesn’t even HAVE an accountant, and they manage to collect sales tax for one state.
If the law is written correctly, and puts the correct burdens on the states who want to participate, it should be no harder to determine the remittance for all 50 states than for the single state.
I would expect that the feds would set up a clearing house, where all the states would register if they wanted to be part. Any business doing an internet sale that had enough sales to be required to participate would send the address through an internet app, and it would come back with the tax required, and the state online payment location to transfer the funds.
Amazon doesn’t have accountants doing this — their program is already written, and it already knows how to charge taxes for everybody, so if they get a purchase through one of their partner stores they can collect.
A brick and mortar business receives return on investment for calculating, collecting and paying the local sales taxes. They receive a value for their time in the form of police, fire departments, schools producing customers & workers (in theory), maintained roads, etc...
How does the business in Podunk, Idaho benefit from doing Virginia’s job of collecting sales taxes? They get no benefit except for the sale, so why should they be forced to be a tax agent for Virginia?
You don’t have a problem with the taxes; even worse, you think that sellers in states miles away should be forced to do the job of the state Treasurer for no benefit.