You're missing 3 nominations: Into the Woods (Best Actress in a Supporting Role), Florence Foster Jenkins (Best Actress in a Leading Role), The Post (Best Actress in a Leading Role).
Looking at this list, I think it has just become customary to nominate her for any role that wouldn't be up for a Razzie. Sure she is a good actress, but not this good.
I sorta have to disagree. I really like her as an actress and a person. I think that she could read the Milwaukee phone book in a Vietnamese accent and I'd think it was great. I'm just sorry that she isn't on here for "Mamma Mia" maybe for this year's sequel - "Here We Go Again".
She is absolutely this good. I don't think a single actor, male or female, comes close to Meryl Streep. Maybe Brando, but I think a lot of his success on-screen comes from his irrepressible charisma (in addition to great acting chops). Streep is pure acting.
I admit it's been a while since I've seen it, but isn't it a little odd that she was considered a supporting actress for playing one of the title Kramers in Kramer vs. Kramer?
The distinction between actors and supporting actors is becoming more and more absurd. Either the definitions should be clearly established in terms of screen-time or number of lines, or the categories should be removed.
You do raise an interesting point. Despite the title, Mrs. Kramer (i.e., Streep) isn't in the movie all that much. It's mostly about Mr. Kramer trying to raise his son after the divorce. So, in that sense, Streep's role is definitely "supporting" in that movie. But she's also the most important female character, so...the female lead. I'd actually say that yes, she's better called a supporting actress than lead actress in Kramer vs. Kramer, but as rocamorar noted, it's certainly up for debate because there is no hard and fast criteria on which to apply these labels.
It's absurd that Tatum O'Neal is the youngest person to win a Best Supporting Oscar. She was clearly a lead role, Street showed up once in a while in Kramer vs Kramer. The title referred to the divorce, which had a huge impact on the two lead characters, Mr. Kramer and his son. The Wizard of Oz was merely a bit character at the end of the trip taken by the lead actors ya know.
I've never thought of her as more than adequate. Some of her foreign accent roles are just bad, sorry. Sophie's Choice was very memorable for the choice, but the rest put entire audiences on suicide watch from having to sit through it. Italians of Madison County? Nope. A dingo ate my baby? Pure Meme Lifetime Achievement Award.
Oscar
Best Performance by an Actress in a Supporting Role
Into the Woods (2014)