Because, the 1K promotes strategic mech building and prevents players just putting on every item (it makes it less RNG), so that players would not have 4 bunker shells, or if they did they have to sacrifice something somewhere. it allows players to choose what they value more (dmg, hp, res drain etc.) and make a build suited to it. 8 Mythical hp. 4 bunkers and 2 valiants.
Unless, it is a module. Then MAYBE.