Picture someone searching "bank" in winter. Without personalization, they get a pile of finance pages, riverbanks, and a food pun. With it, they get the ATM down the street. Personalization is like a local guide pointing you to the right trail instead of dumping you at the base of every mountain in the county.
Sure, there's a risk of echo chambers, but that's a design problem, not a reason to throw away relevance. Standardized results treat everyone like a stranger. A good search engine should know where you're standing before it draws the map.