What "high end electronics" would be taxed at a medium rate? Do billionaires not just use iPhones? Most high end private planes are the same models as regional jets (e.g. Embraer ERJ line), so a tax on them would still be mostly impacting normal folks' plane tickets.

The core problem remains the same: consumption does not scale with wealth. If we limit taxes go a handful of goods and services, then demand is just going to shift to something else. Consumption taxes give billionaires the option to drastically reduce their tax burden by consuming less. The lifestyle of someone with a $20 million net worth is not that much worse than someone with a $2 billion net worth.