The Beyond Light armor and weapons you're receiving today will be sunset in season 15. All items in the game now have a useful life of one year in terms of power levels they can be infused to. The one year counter begins from the date the items were introduced to the game. Shadowkeep items from the first season of SK would have sunset at the end of season 11, items introduced in season 9 should be infusable up to season 12's power cap, and so on. Basically legendary items should be infusable for 4 seasons. Dreambane armor and arc logic were introduced in season 8, so their intended useful life for infusion is seasons 8, 9, 10, & 11. We are currently in season 12 which is why those items can't be infused above 1060.