I mean tbh if you have a durability in melees, you defeat the purpose of back up weapons.
And if you want to put durability on knife, hell yeah I’d dare you to put durability on guns too, like Minecraft or Unturned.
And then once your gun breaks or your knife break, you are totally full of defence. You totally have Kevlar armor on and you can totally fight back
TL;DR: go back to Minecraft