There are more than enough words spilled on the first topic by better writers than myself. If you click around the archives of the substack the linked article is from, you will find plenty. As for the second point: usually LVT is proposed as a more efficient alternative to current taxes, not as an entirely new tax on top of all the currently existing taxes.

In fact, there are people in this thread (inaccurately) accusing the author of being a "single taxer", since there are some Georgists who believe that an LVT could potentially be the only tax.