Exactly what airlines have been doing for decades. Winter, spring, summer, fall, holidays? Travel changes based on seasons is a new revelation? Nothing new there. I'll bet there are few here who remember the OAG. Editions always changed seasonally.

One reason to not book too far in advance. Schedules change, and airlines have no reason to discount ~>90 days in advance. ( all generalities are subject to falsehoods - including this one)