Why does everyone want these at L1? The first time I saw the plans for the Starlink fleet I started wondering if you could use a fleet of satellites to manage

Why does everyone want these at L1? The first time I saw the plans for the Starlink fleet I started wondering if you could use a fleet of satellites to manage incoming solar radiation: https://news.ycombinator.com/item?id=18474244 https://news.ycombinator.com/item?id=18474244 Maybe more an idea for a science fiction novel than a serious plan, but I like the sound of it.