Yes. It is not easy to see “anicca Nature.” It takes a real effort, necessary background knowledge, moral conduct, and many other factors.
– Again, I am not talking about Sybe or anyone else in particular. This is a general statement that I have made in many posts.
This is why the Buddha had doubts about how many people can understand his Dhamma “that has never been known to the world.”
Whether one may grasp the Tilakkhana in this life or not, following even the mundane eightfold path will not go to waste. It is those who have cultivated the mundane path (where the 10 types of miccha ditthi are removed) that are able to comprehend Tilakkhana in this life and start on the Noble Eightfold Path. See, “What is Unique in Buddha Dhamma?“