That used to be the case before when there was only one phase that was fixed. Now, there are two more floating phases and one more under construction.
It is still hard but doable if you are flexible with the timing, but don't count on getting prime weeks.
I am still at the mercy of the school calendar so even though I own a fixed week I never get a chance to use it. Hoping after the kids are in college we can start going to our january fixed week.