It promotes more tactical and thought out combat than just button mashing. All this while not forcing the player to not button mash if they want to, with the caveat of the weapon constantly breaking on them. This unlike some games, that I will not name here, that forces this with slow uninterruptible animations (that makes the game feel clunky and is actual bad game design). It's the limited ammo version of melee weapons (that I guess is hated by some people that just want to be John Rambo in every game that has a shooting element).
Other than this, as stated by the designers, it also makes players use the wide array of weapons in the game instead of just sticking to the favorite or the latest most powerful weapon they find. I mean everyone that has played games for a while knows that in most games you find a wide array of weapons all the time that you don't even bother to pick up because they are less powerful or more ugly than the current weapon you use.
Also it's not like the weapons just brakes out of nowhere, both games do give you a warning before they brake giving you an opportunity to, in a split second, switch the weapon out before going in to, for example, a flurry rush.
I also am fully aware of that people that agree with me in this will continue to do that and people that disagree will not change their minds in the same manner as I will not change my mind around the games that I will not name here.
