Because falling shouldn't always be to your death.
The mod, just by being present on the server (or just being installed on your end for Singleplayer), lets you live fall damage with 1 HP (half a heart), and does the same for tamable entities like wolves, camels, horses, etc. to also prevent annoying accidental pet deaths.
You can use McQoy to edit its config values from ModMenu for Singleplayer use. Otherwise, config values are read every game/server restart from the config folder's file for the mod, and are not world-specific. Config values include
whether to enable/disable the mod entirely, whether to make players and/or tamable entities immune, and how much health to live with.
That's all there is to it!
