The problem with land tax is that it doesn't address the main factor of wealth inequality as it still allows those making the most from the doing the least to pay the least taxes (as a % of income). It's inadequate by itself.

Wealth is generated through productivity whether human or technological. So, taxing that productivity fairly, taxes the wealth fairly. If a business can make $1000 from spending $1 they should be taxed at a higher rate than a business making $10 from every $1 spent regardless of how much profit they make.

A proper productivity tax would also prevent over-production and waste.