state State resistance based on number of turns or effect magnitude instead of chance

[DoubleX 208]

In the default RMVXA and RMMV(I don't know if it's the same for the others as well), the state resistance's in the form of decreasing the chance to inflict a state, but without any other change if the state's still inflicted.
I personally feel that it can be excessively and unnecessarily random, especially for states lasting for several turns and with serious effects.
Therefore, my very naive idea is that, instead setting the state resistance as decreasing the chance to inflict a state, the former should be set as decreasing the number of turns of the inflict state, thus eliminating the randomness completely.

Let's say a state reducing a battler's atk by 50% for 3 turns, which is of course a very serious deal.
But there are some battlers having certain resistance on that state, some may reduce the number of turns to 2, and some may even reduce the number of turns to 1, thus removing the situation of a gamble between having no effect and reducing atk by 50% for 3 turns.

Similarly, state resistance can also be implemented as reducing the state effect magnitude, and in the above case, like reducing it to 25% from 50%.

So what do you think about state resistance? Do you prefer randomness or determinism in this case?