The idea that date flexibility opposes the advantages of the low season seems like a strange intellectual contortion, especially when considering what we would do if we hadn't already invested so much in our travel habits.
Honestly, would we voluntarily choose to pay more to crowd with others if we weren't constrained by fixed dates like school holidays?
If we hadn't already committed our time or money, we would ask ourselves "what's the smartest?" and the answer would always be to look for good deals and peace of mind.
Flexibility is not the enemy of the low season; it is what allows us to access it; without it, like with school children, the promises of the low season remain inaccessible, regardless of attractive prices.