I want to talk about the evolution of Robert as a character
When we are first introduced, I feel he intended as being rather a humble man considering his status, and rather understanding of his own privilege. Which of clearly shown in even his first interaction with Carson, where they discuss the losses of the titanic. I believe the quote that aids my point the most is "[carson]I understand most of the ladies were taken off in time. [Robert] You mean the ladies in first class? God help the poor devils below deck". And even though it's only a small line straight from the begining we see his acknowledgements o those with less privilege than himself, he recognises the issues of the class divide
And we even see it when he refuses to fire Bates, he's told by everyone he knows, pressured by his wife and his staff but he refuses on matters of principle. He judges Cora for her behaviour and words about Bates and she is presented as rather ruthless and Robert does not seem to approve.
However this seems to change as the show goes along, and I see that him through season 6 almost directly juxtaposes how he acted within the 1st episode. He is instead determined to fire Thomas (a man who has worked for him for many years by this point and was very loyal to the family) despite the strong requests of Mary to do the opposite
and I think it is interesting to see how the events of the show, and strangely enough his reluctancy to develop actually did change him and not necessarily for the better (which I think is the opposite for Cora but let's save that for another post)