Thing is, Ikuta's opinion was voiced way, way before the second season. There was plenty of time for the rest of the members to be briefed on what they had to say. Ikuta's complaints were being "poked fun at" because at the time, Nogi management were pushing Ikuta as a mature, responsible character who could even lecture the staff and management. The biggest giveaway is the one line in the episode after Ikuta complained - "This isn't like Nogibingo at all, is it?" - which shows both that the staff were aware of the change, perhaps to buffer against potential backlash later on, and that Ikuta had enough clout to change the very next episode of the show. I also never said that it changed the focus of the group from some hypothetical ur-Nogi to being Puritan, I said that Ikuta complaining got the group as a whole to be even more puritan than they already were. The group's music image was very puritan to begin with, but Ikuta changed their variety image because she was dissatisfied with the punishment games.
If all the others were dissatisfied too, why was Ikuta the only one who got to loudly voice her complaints in the first season - and why didn't the others even get allowed to come with their opinions, if they had them? The scene was a way for management to cast Ikuta as mature and intelligent, and the fact that no one else was allowed to talk (or even had anything to add) means that either the scene was intentionally made to center exclusively on Ikuta, or (more likely) the other members' antipathy was completely scripted between s1 and s2, allowing management to get away with changing Nogibingo to conform to Ikuta's preferences. Ikuta isn't Takamina-level influential, but she's quite influential on Nogi and always has been, and on top of that she's a lot more opinionated than Takamina and thus more likely to complain and get things changed.