/Gamerule DoOldCombat

Before I start, this could inspire other game rules... feel free to add your own suggestions if you are inspired to do so Basically some servers don't update because of some features in Minecraft, one such example are servers that prefer the old combat...it would be false by default By inputting "/Gamerule DoOldCombat True" you'd be able to have the original combat style

"/DoOldCombat False" is the default, and inputting it again would put it back to default

(The command's text has capital letters at the start of each word for added legibility)