A VAT, GST, or sales tax always affects only the final consumer, where as a revenue tax would dig into every stage whenever goods or services are moved between companies.

There is nothing inherently wrong about taxing the revenue at each stage as material flows between companies. Right now we tax those companies profitability instead, and at a much higher rate. So there is an incentive for companies to minimise profitability in terms of how much tax they have to pay. If instead we tax revenue directly it could simplify things and mean that they could optimise profit to some degree. It could lead to more vertical integration but it would also lead to the dissolution of accounting schemes between companies like the double Dutch Irish sandwich (or whatever it's called). Because every time a company makes revenue it would be taxed in that country.

In general you could think of a revenue tax as more of a land tax for companies. Real-estate owners generally pay government an amount per year which is just because they own that property. So think of a revenue tax as one which is applied to businesses.