Searching anew (instead of using one's own cache of previous finds) is still valuable because you may discover better results, or new results that may lead to n

Searching anew (instead of using one's own cache of previous finds) is still valuable because you may discover better results, or new results that may lead to new/better thinking, or the answer to your question might have changed since the last time you searched. If i can't find any of these, then falling back on previous finds is valuable.