This is a vicious thing to do

If you get into the weeds, the issue isn't that UHC updated their coverage policies and practices. It is that they did so without notifying shareholders first.

Incidentally, one upshot of this lawsuit will be a long period of discovery during which UHC will attempt to prove it is fulfilling its fiduciary duty by showing off how many cruel and nefarious methods it uses to fuck over its clients. So, while you might shit on Blackrock for "viciously" exposing UHC's internal practices to the light of day, I've gotta say that I am seeing nothing but positive outcomes as a result.