In general, theory is aimed at classical music, since that is the genre that uses it the most intensely.
My first reaction is to disagree and point to jazz harmony as the place where theory is used "most intensely"
But I think that the reality may be that some genres uses certain areas of music theory more intensely than others.
I see music theory through the lens of an 80/20 rule : 80% of the usefulness lies in 20% of the theory actually taught.
In my theory 101 class I found that that useful 20% was very thinly spread in a frustrating 80% layer of mostly useless info
At least in my amateur pop/rock/funk/jazz/latin/tiki experience.
If I were in a baroque ensemble, where more of the stuff actually applied to my real life music, I might feel different.
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