It's *not* that you can't suitably penalise with improvisation penalties when used just about any time, it's that the hero can concentrate his HP gains on it and make its rating immense.
A good example, I think, would be Knowledgeable (a Lankhor Mhy devotee, say). If this devotee can use it as substitute to all Georgraphy, Mythology, Customs, etc (Language?) skills then there isn't an improvisation penalty high enough to stop it being worthwhile developing Knowledge and nothing else.
That's why you have to curtail the development of generic skills as well as their use.
Richard
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