While Masi undoubtedly fucked it, he looked like a man struggling with his mental health at times during the season. Someone should have recognised that and offered practical assistance. It's also too big a role for one person, as demonstrated by the increase in staff taking on the role for 2022 and the race director alternating race by race.
I also have to wonder to what extent Liberty or the FIA pressured him to make sure the last race provided maximum excitement, and if that played a role in the fiasco, then he is somewhat of a patsy in the whole affair.
That said, yes, he fucked it and his position was untenable, I just doubt he was the only one at fault