Constitutional amendments should be kept nice and simple. The one to repeal the 16th should simply forbid income taxation at all levels of government, local, state, federal, and international. The last is needed to override any treaties future libtard Senates may choose to ratify.
The neat thing about consumption taxes is that they are broad-based. So, even though there is potential to generate a lot of revenue, there also will be a lot of people voting not to have to pay the cost of a too-large government.
I agree that CAs need to be simple. But we can’t both repeal the 16th AND keep a 9% income tax. So we either need several CAs or 1 that clarifies and codifies the rules. If we are going down that route I would love to lock in the rates to prevent Congress from messing with them.