This is a symptom of outdated combat mechanics.
Hopefully by the next game, they will have implemented a working block/dodge system, and real time/interruptible potion drinking.
They need to stop screwing with working mechanincs.
We had block and dodge in Morrowind, it worked great.
In New Vegas when you turned hardcoe mode on your stimpacks (aka health potions in a serenge) healed over time,
and taking more than one extended the duration of heal - not the magnitude.
What you are looking for has already been done, all Beth has to do is not mess it up. But they did anyway.