Now let's further examined each element,
My suggestion allow players to build knowledge of the the gathering profession. Providing a true sense of a profession.
Insect and herbs : The insects and herbs relationship should be dynamic. "If something in the world can change, whether through player interaction or naturally over time - it should”
1) Nocturnal Creatures. Let's say red beetles correlates to Moonleaf in daytime. but at night red beetles may go back to their nests. Instead, gatherer must look for another insect (gleaming moth) when they are searching for Moonleaves at night. This ensures gatherer has to know when and where to find the desired herbs.
2) Seasonal relationship: We can further expand the scale by making these relationship dependent on seasons. Maybe in winter, all beetles and moths becomes inactive. However, a special breed of flower (pinkish violets) may grow only in winter. Thus, gatherer must change from looking for beetles to pinkish violets in winter.
3) Evolving relationship overtime : Throughout the 10 year storyline, major events like disasters, or species extinction may occur. The relationship between herbs and insects / flowers should be changed whenever such huge events takes place.
4) Scaling with higher difficulties : Further down the road, the game will surely introduce rarer herbs and it would be best if the difficulty of detecting these rare herbs rise together. We can introduce colour changing flowers or herbs eating insects. E.g. flower A is Red in the morning, Pink at noon, and white at night. Gatherer can only find the rare herbs when the flower is red. Another example would be a swarm of “herbs – eating insects”. The desired herbs would be gone if a swarm flew close by. The swarm would leave traces on their path, and gatherers must take the path of the swarm into consideration to determine if certain herbs could be found. They must able to predict where the swarm is heading, or else the swarm may consume his herbs while he is playing the “Spot the difference” skill challenge.
5) Complex relationships: It is not necessary to have 1 insect correlates to a single type of herbs. We can have herbs that can only be found at locations where 2 or 3 types of insects inhabit. On the contrary, the relationship can also be biome dependent. Red beetles may indicate existence of Moonleaf on plain field. However ,if you are in a tundra, red beetles may indicate existence of another herbs (say Hydromiel ). The more species and herbs available, the richer the world will feel, and the deeper the profession is. This means the devs can keep adding depth to the profession over the 10 year story-line.
Book record (encyclopedia):
The bible that every herbs gatherer authors. It would include all the insects, plants and herbs known to that gatherer. It should be “Sortable”, “Searchable” and allow changes anywhere in the field. I believe players who love herbs gathering would prefer building up their knowledge in the field instead of spending more time traveling and come back to the spot later on to find the insect they just discovered is gone.
The pictures of plants and insects, may become more and more accurate if the gatherer comes into contact with said insects / plants more often. However, the relationship between the 2 is never stated to the players. Instead, the player must draw their own conclusions from their observation in the field. And of course, they are allowed to change the description of such relationship anytime they want.
Gatherers would be able to share their knowledge with other gatherers in game, especially within a guild. With the ever changing environment, and constant increasing number of herbs, the goal is to make mapping out all the relationships a near impossible task. It maybe even better if contradicting relationships can be proved in different locations to promote academic arguments over the truth.