Generally the primary concern is safety, and then aesthetics. Having a drop cable going through a tree is safe (they're not power-carrying), and looks better than one visible in the open space. We also generally try to "follow path", that is, not forge a new route, if there are existing communications utility drops from AT&T and Comcast. It's generally best to have them all in one place, rather than crisscrossing overhead each on their own path.
But, regarding that tree: The fiber optic drop cable is very, very tough, and many go through trees with no issues. The fiber is a tiny element inside, housed with kevlar strength members alongside. They can withstand being struck, driven over, etc. Pretty much anything except loppers and chainsaws - so I suppose care is necessary when pruning when wires are present.