Hello,
if you bought the software, you are able to get direct support through the shopware account. I am sure there are many things that can be solved by our support team. There is no current issue with taxes - so I think this could be solved by contacting the official software support.
We are in an early state of the product and it ist meant as MVP, so many things are could not be compared to shopware 5, since shopware 6 is a new product with different functionalities. If you need a product that helps you to set up a shop very quickly, I guess shopware 5 is the right way to go. Shopware 6 has a lot of potential, but at the current state you need to individualize (plugin porgramming) some things for your usecases.
Moritz