iirc someone on these threads mentioned that Klm (or was it Schiphol) has made the operational decision to stretch capacity to 100% so there is no room for slack and the first insignificant delay brings the (delft) house of cards down.
If you have a Japan-like level of planning and execution, 100% capacity might work. But here... I must say my last two flights ex AMS were both delayed roughly an hour. Hope it doesnt become the new norm.