Virtual Insanity

Most VTTs can do a lot that you can’t do on a physical tabletop. All the players can see the dice, which limits cheating, and potentially see each other’s hit points. You never run out of space on your character sheet or have to translate poor penmanship. Distances are easily tracked. Everyone can see the initiative tracker. The GM can check characters between games and look at the characters of absent players. You can quickly draw zones and details on the map, including perfect circles. It can do a lot.

Tracking elevation… less so.

You can do fun things like different areas of a large map for different heights. A battlemap divided into layers. Or putting a symbol on a flying creature. But none of these are as effective at conveying flight as being able to put a mini on a clear plastic dice box or elevation stand, or even a stack of dice.