[darkraito]

There are benefits on checking the number of stacks for other Buffs. This is especially true for complex profile built. Lets assume a simple form of scenario below:

Steady Hands (SH) by default have 5 stacks at start.
Great Strides (GH) has 3 stacks at start. Some people like me like to use Observe (O) in order to get 'GOOD' status before actually using Touches.
Normally, we would use SH first then GS:
SH4:GS3 # status at Normal, number denotes the number of stacks
Use Observe
SH3:GS2 # still at Normal
Use Observe
SH2:GS1 # still at Normal -> Use Touches skill (fallback) in order to reduce the number of CP lost.

at GS3, and GS2, if we could check for its number of stacks, we could refine the touches to only execute when its "Good" and/or "Excellent".

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If we add another skills such as Innovation, that would lead to an even more complex skill profile. But I believe the above example is enough.