Underground power can solve tree fall issues. But it is much more expensive, both initially, and when any repairs or new connections are needed. The number of repairs likely goes down, but time to repair goes way up. In some areas, soil conditions make it pretty much impossible.
Trenching for the install may require more plant disturbance than would be needed to maintain nearby trees on a regular basis.
Distributed generation and redudnant distribution can help reduce the impact as well. Everything costs money though.