Practice does not perfect, it makes permanent.
So, the faculty or capacity developed from a state of latency or underdevelopment remains the same all throughout without diminution or atrophy? LOL.
There are fluctuations in a particular faculty leading to ultimate collapse despite our best efforts at maintaining it intact.
Mental alertness, sense faculties, body building, somersaulting, walking, running, painting, singing and other faculties peak within the innate capacity limits of the concerned person provided they are worked upon by employing the correct training methods of arousing them and they then begin flagging as time passes by and as age or weakness of any kind sets in. This is always the case.
To believe that insentience can give rise to sentience and to assume that random and blind forces can ever produce order are the biggest stupidities that can be made by people - you're a prime example of big time stupidity.Practice is only positive if that which is being practiced is correct and true.
Obviously, we can develop only those capacities that we possess and the way they develop or manifest from a state of latency depends on correct training methods.
There's nothing like true and correct - well developed muscles can be used to lift heavy loads as well as to bash up an enemy, a knife can be used to chop veggies as well as to murder and the cultivation of a keen mind can lead to deeper insights of nature and being and at the same time a well developed mind can create evils like nukes, germ warfare, mind control, robberies, computer viruses and the like.
This list of the dual nature of things can stretch on endlessly.
The bottom line is this - there's nothing rigidly good or rigidly bad but that everything has good and bad aspects in it that would depend on the way a thing is employed or better put the utility of a thing is dependent on the use it is put to.
Get it, dunce?