Why do you think consumption taxes are inherently progressive? It may be possible to make them that way, but I don't see how that is an inherent aspect.
The poor and middle classes generally have to spend the vast majority of their income and invest very little. All that is generally "consumption" the rich may seem to consume more, but as a percentage of their income it's far less than others. You can attempt to fix this by making food and other staples not subject to taxation and with luxury taxes, but that adds complications and you've pointed out the other dangers. I suspect any attempt to create progressive consumption taxes will be easily gamed. I'm open to the idea if it can be made to work, but taxing wealth has a big advantage of being relatively simple and much harder to game.