https://www.gamespot.com/articles/destiny-2s-iron-banner-plays-differently-than-you-/1100-6453954/

The first-ever Iron Banner event in Destiny 2 is now underway. And while some of the core elements remain the same as in the original Destiny--it's a highly competitive Crucible mode that's only available for a limited time--things are a quite a bit different than you remember.