Some Nurse add-ons have such bad drawbacks, it makes them worthless

Take a look at this one add-on I found in my bloodweb.
This add-on increases the chain-blink window, but removes the Nurse's one base chain-blink, and increases the fatigue duration.
There is literally no point in using this add-on as it makes itself completely useless on its own.
I understand that you're potentially meant to use another add-on to give her more chain-blinks, like Campbell's Last Breath that adds two, but the point still stands that this one add-on, and some others in the Nurse's kit, only exist to be a detriment to her.
Add-ons aren't meant to make you worse than you already are. An add-on should never be reliant on another add-on to make it not useless.
I understand that the only way to balance the Nurse's add-ons are to give some of them negatives, but to make some add-ons so negative that they're only useful when used with another add-on is insane.
Comments
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A lot of her addons are pretty terrible imo. Very rare addons should be mostly positive with a small downside.1