I've seen this argument 100x but it seems like most people prefer a solid fandom versus the love of the public.
Being a celebrity is all about getting publicity, and general public attention gives you all the benefits such as media attention, which translates over to variety show appearances, hosting roles, significant drama roles from the jump (if your idol is into acting), CFs where you make all the money, etc.
Big fandom is good and all, gives you plenty of stability but album sales and tours hardly make much money compared to all the CFs you get from general publicity and they're hella expensive compared to the actual individual members make after all the expenses and company cut . Especially in the first 7 years of the contract, the group makes so much little money due to usually horrible contracts, and that's when your fandom is at its most supportive (as compared to when disbandment and everyone focuses on solo activities). When the group disbands as well, the fandom rarely translates over to individual activities as compared to general public recognition, whereas GP recognition is much more beneficial for career longevity.