I am totally with you on both best female actress and best male supporting actor. I have not seen Darkest Hour but Gary Oldman is heck of an actor so I am sure he did a great job.Two of my favourite movies in the theatre won best actor Oldman, best actress McDormand and best supporting actor Sam Rockwell.
Two quality films IMO
Just like every year, Oscars always make me go wth. I have seen Shape of the Water and found it to be a good movie with good acting .. but ... best movie? I don't think I see it that way.