Oh, I definitely agree that Filoni had a hand in Boba's arc.
A *major* hand! I have zero doubt about that.
Keeping an aging fan-favorite character on the board is utterly meaningless if he's written in complete contrast to what his place on the board is supposed to be. Fett's behavior and decision-making is often laughably stupid. So, since his "place on the board" is supposed to be a leadership position, that makes his presence more of a detriment to the SW landscape than his absence was.
This show seemed to be a staging ground for expanding the SW underworld, with Fett in a "Godfather" role. Had that played out, his decades-long reputation for competence and ruthlessness could've actually made for an intriguing story where his new role changes his perspective over time and he starts behaving in a different way.
Instead, not only was he always too inept to be a Godfather, he's too inept to even be counted on to make a Godfather's Pizza order.
What they did to this character is tragic. He's losing a duel to a guy he shot down as a teenager with weapons he's relied on all his life, and then finding greater success with a melee weapon he only learned to use recently. He's failing to maneuver his own ship (which he piloted for decades) out of a hangar and
forgets to use it when his "army" is flailing as target practice on the streets of his city. Instead, he goes to the exact same place where his ship is and rides back fully exposed atop a Rancor that he just recently acquired. All for the purpose of "cuz it's soooooo cool!"
Without Fennec, Fett would be dead. His leadership position can't be taken seriously because *he* can't be taken seriously. He's comic relief. The best episodes of his show are the ones he doesn't play a role in. That speaks volumes. He serves no useful purpose, and his role could've been filled equally by a new character because he himself is a totally different character right now.