In Destiny 2, there are hidden areas marked on your map for you to explore on each of the planets in the solar system. Sometimes the areas are difficult to find, other times they’re simple and easy to access. Regardless of the difficulty level, though, the lost sectors are an interesting addition to the exploration and completion of every planet. In order to say you’ve completed your exploration of a specific planet, you have to have explored every lost sector, essentially, to earn that title.
Personally, I’m not that interested in the title or the accolades associated with exploring everything there is to explore. I did that once in World of Warcraft and that was enough. I thought it was a huge achievement at the time, to have explored every part of the map possible, and I remember getting it in Wrath of the Lich King, when achievements first came out in the game. I was playing during a time when flying was impossible in the regular old world, so I had to do all my exploration in zones like the Blasted Lands and Feralas by foot. It wasn’t especially difficult, but it was mostly just time-consuming. A lot of the achievements in this game are like that; they don’t require an immense amount of skill, just a lot of time and dedication and effort directed at one thing.
Back to Destiny 2, though. Lost sectors are part of the game, regardless of whatever complaints people may have about them. I don’t think they’re a huge source of contention in the community, although I’m not even sure if they existed back in the original Destiny game. Regardless, I think they’re pretty fun and I’m glad they’re a part of the game. Hopefully in future Destiny releases they continue iterating on the formula they started here.