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[RC]

7. Burying power lines are a lot more expensive than stringing them overhead.

Burying them in established neighborhoods can be a logistical nightmare. Then there is the finding and fixing a blowup underground.
And don't forget the idiot driving a fence post through a high tension line where it comes up to a transformer, without a call for locating first.
Or even where they are not buried deep enough because of landscaping after the fact. Oh, and don't forget flooding of transformers.
Burying power lines is not a cure all. It just changes the problems encountered and makes then more expensive to remedy.