I'm also still researching. Love Barty's game, but she probably beat the least number of top 10 players in winning her 3 majors than anyone in history(not counting the depleted majors of 70s). She only played one top 10 player in winning those 3 majors. Also she played only one event in 2020, but because of COVID they count all those weeks in 2020 as weeks at #1 for her which seems a bit unfair when you compare to other year end #1's. Azarenka had to deal with pretty tough competition with Serena in 2 USO finals, and I find her year end #1 in 2012 more impressive than Barty's 2 year end #1's(again I don't count 2020)
Also Azarenka won ten 1000 level events, Barty only 3(but she did win YEC). Azarenka beat Serena in the finals of 4 of those 1000 level events and Sharapova in 3 of them. Barty beat Jill Teichmann in the final of one of her 1000 level events