I watched the video a long ass time ago, and I'm not reading the book.
Looking at a popular example, Caesar, and his civil war, you can see that he made a ton a promises.
He promised his soldiers land, his centurions political positions, his backers in rome both a payment on his debts and leniency under his rule. He promised the people of northern Italy (a large part of his army) full Roman citizenship, and promised he would carry on and take revenge on the parthians.
He would do all of it as dictator, except invading the parthians because spoiler:he died
The senators who remained in Rome during the war, the ones who fled and received clemency, or even obtained their position through Caesar, rightfully realized early on that the Senate was reduced to a figure head.
Those, who as of recently had enormous political power, were reduced to mere rubber stamps.
Was it possible for Caesar to appease everyone? Did he particularly want to? Who was actuslly benefiting from this whole ordeal?
Who is to say, but it is interesting to think about.