Hi,
In Halo master Chief collection, every season, every weekly, there was a possibility to gain points (which you later spend on a cosmetics gear), by playing campaign. It was some sort of motivator to re-play full campaign.
But as it seams in Halo Infinite there is no point to re-play campaign.
There were a couple of unique cosmetics gear parts in season 1. But no new rewords for season 2 gear set.
That is lame.