The new system may be full of bugs, but why would the old system be any better? I've seen old systems. Some of them get their bugs fixed. Many get their bugs worked around, either by the devs, but often by the users themselves: "don't click here, it makes the program crash!"
As for Land Value Tax, do not confuse land with other kinds of wealth. Land doesn't move. Its surface doesn't change. It's market value can change, but it's not wildly fluctuating, like, say, Oil. That makes it much, much easier to tax than whatever property you build on top of it, or goodness forbid whatever precious trinket you might store in that property.
The other proposition, taxing salaries, works today. Taxing more or less salary is just a knob to turn. And at the time such taxes were put in place in France after WW2, the change was swift, and the "new system, full of bugs" worked. Communism (or something close to it) worked, in a Western, democratic country. Okay, it was only applied to school, roads, hospitals, retirement, unemployment insurance, energy… but that's already a pretty big deal, don't you think?
We could "just fix the tax bracket", but then my first reflex would be have a top marginal rate at 100%. I want a limit on maximum individual income. Something like $10M per year to begin with. That may seem ludicrous, to inflict such a brutal end on the American Dream itself. That's it, game over, no one will get rich ever again. But really, that dream is a lie to begin with.
Better yet, we could tether the limit to the median income. Want to get rich? Make your country rich first. That at least should appeal to patriotism, which I believe is still fairly strong in the US.