This article makes the assumption that because Boba did not act the way that some expected him to that that means that there was no plan for the show. I do not think that is true. I actually think that they knew exactly what they were doing, and the Book of Boba Fett is an excellent balancing act of everything that came before it.

Rather than make the show exactly the same as Din's show, the writers used Boba's escape from the Sarlaac Pit as a great opportunity to tell a story about a man shaken by a near-death experience into changing his ways. Even better, they use the myth of his demise as a way for him to escape the life he could never have walked away from. They are then able to use Boba’s association (both in-universe and to the audience) with another Star Wars villain, Jabba the Hutt, to give Boba a new mission and setting that is different from Din and The Mandalorian. Boba Fett takes the mantle of Jabba, but he decides to use it to fight against the criminal institution that held him captive for so long. To go along with this new mission, the writers crafted a conflict specific to Boba by having everyone question him abandoning hunting. Why quit when he was on top? Since reputation is on the line (again, both in-universe and to the audience), Boba has an even higher mountain to climb as the better, crime-free lifestyle he offers to everyone is put under greater scrutiny at even the first sign of opposition. But like the absolutely awesome warrior he is, he sticks it out and makes it work.

While others may disagree with the choice to change Boba's character, I personally love it! Unlike what the sequels did to change Han and Luke (not a fan, IMO), Boba's life is actually better than it was before, and he becomes a source of hope for others.